Wikipedia:Vital articles/data/O.json

{	"Oceania": { "level": 2, "topic": "Geography", "section": "Geography" },	"Ottoman Empire": { "level": 3, "topic": "History", "section": "Post-classical history" },	"Opera": { "level": 3, "topic": "Arts", "section": "Performing arts" },	"Orchestra": { "level": 3, "topic": "Arts", "section": "Performing arts" },	"Ontology": { "level": 3, "topic": "Philosophy and religion", "section": "Philosophical branches and concepts" },	"Old age": { "level": 3, "topic": "Everyday life", "section": "Family and kinship" },	"Olympic Games": { "level": 3, "topic": "Everyday life", "section": "Recreation and entertainment" },	"Oral tradition": { "level": 3, "topic": "Society and social sciences", "section": "Society and social sciences: General" },	"Obesity": { "level": 3, "topic": "Biology and health sciences", "section": "Health, fitness, and medicine" },	"Orbit": { "level": 3, "topic": "Physical sciences", "section": "Astronomy" },	"Outer space": { "level": 3, "topic": "Physical sciences", "section": "Astronomy" },	"Optics": { "level": 3, "topic": "Physical sciences", "section": "Physics" },	"Organism": { "level": 3, "topic": "Biology and health sciences", "section": "Biology" },	"Organic chemistry": { "level": 3, "topic": "Physical sciences", "section": "Chemistry" },	"Oxygen": { "level": 3, "topic": "Physical sciences", "section": "Chemistry" },	"Oven": { "level": 3, "topic": "Technology", "section": "Food and health" },	"Ode": { "level": 4, "topic": "Arts", "section": "Basics" },	"Oresteia": { "level": 4, "topic": "Arts", "section": "Fiction of antiquity" },	"Oedipus Rex": { "level": 4, "topic": "Arts", "section": "Fiction of antiquity" },	"One Thousand and One Nights": { "level": 4, "topic": "Arts", "section": "Fiction of antiquity" },	"Othello": { "level": 4, "topic": "Arts", "section": "Fiction of early printed book era" },	"On the Road": { "level": 4, "topic": "Arts", "section": "Fiction of modern era" },	"One Hundred Years of Solitude": { "level": 4, "topic": "Arts", "section": "Fiction of modern era" },	"One Piece": { "level": 4, "topic": "Arts", "section": "Comics" },	"On the Consolation of Philosophy": { "level": 4, "topic": "Arts", "section": "Nonfiction of antiquity" },	"Organon": { "level": 4, "topic": "Arts", "section": "Nonfiction of antiquity" },	"On the Origin of Species": { "level": 4, "topic": "Arts", "section": "Nonfiction of modern era" },	"Oxford English Dictionary": { "level": 4, "topic": "Arts", "section": "Nonfiction of modern era" },	"Odyssey": { "level": 4, "topic": "Arts", "section": "Poetic works of antiquity" },	"Oku no Hosomichi": { "level": 4, "topic": "Arts", "section": "Poetic works of early printed book era" },	"Oboe": { "level": 4, "topic": "Arts", "section": "Musical instruments" },	"Outsider art": { "level": 4, "topic": "Arts", "section": "Contemporary art" },	"Optical illusion": { "level": 4, "topic": "Arts", "section": "Concepts and forms" },	"Origami": { "level": 4, "topic": "Arts", "section": "Concepts and forms" },	"Oil painting": { "level": 4, "topic": "Arts", "section": "Concepts and forms" },	"Olmec colossal heads": { "level": 4, "topic": "Arts", "section": "Sculpture" },	"Organ (biology)": { "level": 4, "topic": "Biology and health sciences", "section": "Basics_2" },	"Olfactory system": { "level": 4, "topic": "Biology and health sciences", "section": "Nervous system" },	"Ovary": { "level": 4, "topic": "Biology and health sciences", "section": "Reproductive system" },	"Oxytocin": { "level": 4, "topic": "Biology and health sciences", "section": "Biochemistry and molecular biology" },	"Ontogeny": { "level": 4, "topic": "Biology and health sciences", "section": "Animal ontogeny" },	"Organelle": { "level": 4, "topic": "Biology and health sciences", "section": "Organelles" },	"Oyster": { "level": 4, "topic": "Biology and health sciences", "section": "Mollusks" },	"Octopus": { "level": 4, "topic": "Biology and health sciences", "section": "Mollusks" },	"Ostracod": { "level": 4, "topic": "Biology and health sciences", "section": "Crustaceans" },	"Odonata": { "level": 4, "topic": "Biology and health sciences", "section": "Odonata" },	"Orthoptera": { "level": 4, "topic": "Biology and health sciences", "section": "Orthoptera" },	"Ostracoderm": { "level": 4, "topic": "Biology and health sciences", "section": "Agnatha" },	"Osteichthyes": { "level": 4, "topic": "Biology and health sciences", "section": "Fishes" },	"Oarfish": { "level": 4, "topic": "Biology and health sciences", "section": "Fishes" },	"Ophidiiformes": { "level": 4, "topic": "Biology and health sciences", "section": "Fishes" },	"Ocean sunfish": { "level": 4, "topic": "Biology and health sciences", "section": "Tetraodontiformes" },	"Old World vulture": { "level": 4, "topic": "Biology and health sciences", "section": "Accipitriformes and Falconiformes" },	"Osprey": { "level": 4, "topic": "Biology and health sciences", "section": "Accipitriformes and Falconiformes" },	"Old World flycatcher": { "level": 4, "topic": "Biology and health sciences", "section": "Passerida" },	"Old World sparrow": { "level": 4, "topic": "Biology and health sciences", "section": "Passerida" },	"Ovenbird (family)": { "level": 4, "topic": "Biology and health sciences", "section": "Tyranni" },	"Owl": { "level": 4, "topic": "Biology and health sciences", "section": "Strigiformes" },	"Otter": { "level": 4, "topic": "Biology and health sciences", "section": "Carnivora" },	"Orca": { "level": 4, "topic": "Biology and health sciences", "section": "Cetaceans" },	"Opossum": { "level": 4, "topic": "Biology and health sciences", "section": "Marsupials" },	"Orangutan": { "level": 4, "topic": "Biology and health sciences", "section": "Primates" },	"Old World monkey": { "level": 4, "topic": "Biology and health sciences", "section": "Primates" },	"Orchid": { "level": 4, "topic": "Biology and health sciences", "section": "Asparagales" },	"Oak": { "level": 4, "topic": "Biology and health sciences", "section": "Fagales" },	"Oleaceae": { "level": 4, "topic": "Biology and health sciences", "section": "Lamiales" },	"Orange (fruit)": { "level": 4, "topic": "Biology and health sciences", "section": "Culinary fruits" },	"Olive": { "level": 4, "topic": "Biology and health sciences", "section": "Culinary fruits" },	"Okra": { "level": 4, "topic": "Biology and health sciences", "section": "Botanical fruits used as culinary vegetables" },	"Oat": { "level": 4, "topic": "Biology and health sciences", "section": "Grains" },	"Oryza sativa": { "level": 4, "topic": "Biology and health sciences", "section": "Grains" },	"Onion": { "level": 4, "topic": "Biology and health sciences", "section": "Root vegetables" },	"Oral hygiene": { "level": 4, "topic": "Biology and health sciences", "section": "Health and fitness" },	"Occupational safety and health": { "level": 4, "topic": "Biology and health sciences", "section": "Health and fitness" },	"Opium": { "level": 4, "topic": "Biology and health sciences", "section": "Drugs and pharmacology" },	"Obstetrics and gynaecology": { "level": 4, "topic": "Biology and health sciences", "section": "Fields of medicine" },	"Oncology": { "level": 4, "topic": "Biology and health sciences", "section": "Fields of medicine" },	"Ophthalmology": { "level": 4, "topic": "Biology and health sciences", "section": "Fields of medicine" },	"Optometry": { "level": 4, "topic": "Biology and health sciences", "section": "Fields of medicine" },	"Otorhinolaryngology": { "level": 4, "topic": "Biology and health sciences", "section": "Fields of medicine" },	"Organ transplantation": { "level": 4, "topic": "Biology and health sciences", "section": "Medical procedures" },	"Offal": { "level": 4, "topic": "Everyday life", "section": "Meat and other animal products" },	"Orphan": { "level": 4, "topic": "Everyday life", "section": "Marriage and parenting" },	"Oral sex": { "level": 4, "topic": "Everyday life", "section": "Sexuality and gender" },	"Orgasm": { "level": 4, "topic": "Everyday life", "section": "Sexuality and gender" },	"Orienteering": { "level": 4, "topic": "Everyday life", "section": "Other individual sports" },	"Olympic weightlifting": { "level": 4, "topic": "Everyday life", "section": "Other individual sports" },	"Ob (river)": { "level": 4, "topic": "Geography", "section": "Asia_2" },	"Ohio River": { "level": 4, "topic": "Geography", "section": "North America_2" },	"Orinoco": { "level": 4, "topic": "Geography", "section": "South America_2" },	"Orange River": { "level": 4, "topic": "Geography", "section": "Africa_2" },	"Outback": { "level": 4, "topic": "Geography", "section": "Oceania_4" },	"Oman": { "level": 4, "topic": "Geography", "section": "West Asia" },	"Ontario": { "level": 4, "topic": "Geography", "section": "Canada" },	"Ouagadougou": { "level": 4, "topic": "Geography", "section": "Burkina Faso" },	"Oran": { "level": 4, "topic": "Geography", "section": "Algeria" },	"Omdurman": { "level": 4, "topic": "Geography", "section": "Sudan" },	"Osaka": { "level": 4, "topic": "Geography", "section": "Japan" },	"Oslo": { "level": 4, "topic": "Geography", "section": "Norway" },	"Omsk": { "level": 4, "topic": "Geography", "section": "Russia_2" },	"Odesa": { "level": 4, "topic": "Geography", "section": "Ukraine" },	"Ottawa": { "level": 4, "topic": "Geography", "section": "Canada_2" },	"Old Kingdom of Egypt": { "level": 4, "topic": "History", "section": "Africa_2" },	"Olmecs": { "level": 4, "topic": "History", "section": "Americas_2" },	"Odrysian kingdom": { "level": 4, "topic": "History", "section": "Europe_2" },	"Ostsiedlung": { "level": 4, "topic": "History", "section": "Western Europe" },	"Oyo Empire": { "level": 4, "topic": "History", "section": "Africa_4" },	"Ottoman wars in Europe": { "level": 4, "topic": "History", "section": "Eastern Europe and Central_2" },	"Operation Condor": { "level": 4, "topic": "History", "section": "South America" },	"Order of operations": { "level": 4, "topic": "Mathematics", "section": "Basics" },	"Open set": { "level": 4, "topic": "Mathematics", "section": "Geometry" },	"Ordinary least squares": { "level": 4, "topic": "Mathematics", "section": "Statistics and probability" },	"Observational study": { "level": 4, "topic": "Mathematics", "section": "Statistics and probability" },	"Ordinary differential equation": { "level": 4, "topic": "Mathematics", "section": "Calculus and analysis" },	"Operations research": { "level": 4, "topic": "Mathematics", "section": "Other" },	"Oprah Winfrey": { "level": 4, "topic": "People", "section": "Hosts and performers" },	"Osamu Tezuka": { "level": 4, "topic": "People", "section": "Cartoonists, comics artists, and illustrators" },	"Oscar Niemeyer": { "level": 4, "topic": "People", "section": "Architects" },	"Ovid": { "level": 4, "topic": "People", "section": "Europe" },	"Omar Khayyam": { "level": 4, "topic": "People", "section": "Asia_2" },	"Ouyang Xiu": { "level": 4, "topic": "People", "section": "Asia_2" },	"Oscar Wilde": { "level": 4, "topic": "People", "section": "UK and Ireland" },	"Orhan Pamuk": { "level": 4, "topic": "People", "section": "Asia_4" },	"Ousmane Sembène": { "level": 4, "topic": "People", "section": "Directors" },	"Orson Welles": { "level": 4, "topic": "People", "section": "Directors" },	"Origen": { "level": 4, "topic": "People", "section": "Pre-Schism" },	"Osman I": { "level": 4, "topic": "People", "section": "Western Asia_2" },	"Otto the Great": { "level": 4, "topic": "People", "section": "Holy Roman Empire" },	"Oda Nobunaga": { "level": 4, "topic": "People", "section": "Japan" },	"Oliver Cromwell": { "level": 4, "topic": "People", "section": "England and Scotland_2" },	"Olusegun Obasanjo": { "level": 4, "topic": "People", "section": "Western Africa" },	"Otto von Bismarck": { "level": 4, "topic": "People", "section": "Germany_2" },	"Osama bin Laden": { "level": 4, "topic": "People", "section": "Asia_9" },	"Otto Hahn": { "level": 4, "topic": "People", "section": "Chemistry" },	"Ole Einar Bjørndalen": { "level": 4, "topic": "People", "section": "Biathlon" },	"Occam's razor": { "level": 4, "topic": "Philosophy and religion", "section": "Concepts_2" },	"Opinion": { "level": 4, "topic": "Philosophy and religion", "section": "Concepts_2" },	"Origin myth": { "level": 4, "topic": "Philosophy and religion", "section": "Beliefs" },	"Orthodoxy": { "level": 4, "topic": "Philosophy and religion", "section": "Theistic philosophies" },	"Old Testament": { "level": 4, "topic": "Philosophy and religion", "section": "Common concepts" },	"Orthodox Judaism": { "level": 4, "topic": "Philosophy and religion", "section": "Judaism" },	"Oriental Orthodox Churches": { "level": 4, "topic": "Philosophy and religion", "section": "Branches" },	"Om": { "level": 4, "topic": "Philosophy and religion", "section": "Common concepts_2" },	"Old Norse religion": { "level": 4, "topic": "Philosophy and religion", "section": "Ancient religions" },	"Osiris": { "level": 4, "topic": "Philosophy and religion", "section": "Egyptian mythology" },	"Odysseus": { "level": 4, "topic": "Philosophy and religion", "section": "Greek mythological heroes" },	"Odin": { "level": 4, "topic": "Philosophy and religion", "section": "Norse mythology" },	"Observation": { "level": 4, "topic": "Physical sciences", "section": "Basics" },	"Ounce": { "level": 4, "topic": "Physical sciences", "section": "Mass" },	"Ohm": { "level": 4, "topic": "Physical sciences", "section": "Electromagnetism" },	"Observatory": { "level": 4, "topic": "Physical sciences", "section": "Observational astronomy" },	"Oort cloud": { "level": 4, "topic": "Physical sciences", "section": "Solar System" },	"Orion Nebula": { "level": 4, "topic": "Physical sciences", "section": "Notable nebulae" },	"Omega Centauri": { "level": 4, "topic": "Physical sciences", "section": "Other notable objects" },	"Orbital mechanics": { "level": 4, "topic": "Physical sciences", "section": "Orbital mechanics" },	"Orion (constellation)": { "level": 4, "topic": "Physical sciences", "section": "Constellations" },	"Observable universe": { "level": 4, "topic": "Physical sciences", "section": "Physical cosmology" },	"Organometallic chemistry": { "level": 4, "topic": "Physical sciences", "section": "Chemistry: General" },	"Ozone": { "level": 4, "topic": "Physical sciences", "section": "Chemical elements_2" },	"Osmium": { "level": 4, "topic": "Physical sciences", "section": "Chemical elements_2" },	"Organic compound": { "level": 4, "topic": "Physical sciences", "section": "Chemical compounds: General" },	"Oxide": { "level": 4, "topic": "Physical sciences", "section": "Inorganic compounds" },	"Organophosphorus chemistry": { "level": 4, "topic": "Physical sciences", "section": "Organic compounds" },	"Organosilicon chemistry": { "level": 4, "topic": "Physical sciences", "section": "Organic compounds" },	"Organosulfur chemistry": { "level": 4, "topic": "Physical sciences", "section": "Organic compounds" },	"Ore": { "level": 4, "topic": "Physical sciences", "section": "Petrology" },	"Oil shale": { "level": 4, "topic": "Physical sciences", "section": "Petrology" },	"Oasis": { "level": 4, "topic": "Physical sciences", "section": "Fluvial landforms" },	"Oceanic trench": { "level": 4, "topic": "Physical sciences", "section": "Oceanic and coastal landforms" },	"Ozone depletion": { "level": 4, "topic": "Physical sciences", "section": "Atmosphere" },	"Oceanography": { "level": 4, "topic": "Physical sciences", "section": "Oceanography" },	"Ocean": { "level": 4, "topic": "Physical sciences", "section": "Oceanography" },	"Ocean current": { "level": 4, "topic": "Physical sciences", "section": "Oceanography" },	"Orange (colour)": { "level": 4, "topic": "Physical sciences", "section": "Color terms" },	"Oil drop experiment": { "level": 4, "topic": "Physical sciences", "section": "Basics_9" },	"Ohm's law": { "level": 4, "topic": "Physical sciences", "section": "Electrical circuits" },	"Oscillation": { "level": 4, "topic": "Physical sciences", "section": "Basics_10" },	"Osmosis": { "level": 4, "topic": "Physical sciences", "section": "Fluid mechanics" },	"OECD": { "level": 4, "topic": "Society and social sciences", "section": "Governmental organizations" },	"OPEC": { "level": 4, "topic": "Society and social sciences", "section": "Governmental organizations" },	"Organization for Security and Co-operation in Europe": { "level": 4, "topic": "Society and social sciences", "section": "Governmental organizations" },	"Organization of American States": { "level": 4, "topic": "Society and social sciences", "section": "Governmental organizations" },	"Origin of language": { "level": 4, "topic": "Society and social sciences", "section": "Basics_2" },	"Orthography": { "level": 4, "topic": "Society and social sciences", "section": "Basics_2" },	"Old English": { "level": 4, "topic": "Society and social sciences", "section": "Germanic languages" },	"Old Church Slavonic": { "level": 4, "topic": "Society and social sciences", "section": "Slavic languages" },	"Odia language": { "level": 4, "topic": "Society and social sciences", "section": "Indo-Aryan languages" },	"Oromo language": { "level": 4, "topic": "Society and social sciences", "section": "Afroasiatic languages" },	"Organized crime": { "level": 4, "topic": "Society and social sciences", "section": "Crime" },	"Opinion poll": { "level": 4, "topic": "Society and social sciences", "section": "Politics" },	"Oligarchy": { "level": 4, "topic": "Society and social sciences", "section": "Forms of government" },	"Organization": { "level": 4, "topic": "Society and social sciences", "section": "Groups" },	"Orphanage": { "level": 4, "topic": "Society and social sciences", "section": "Services and institutions" },	"One-child policy": { "level": 4, "topic": "Society and social sciences", "section": "Issues" },	"Officer (armed forces)": { "level": 4, "topic": "Society and social sciences", "section": "Military ranks" },	"Orchard": { "level": 4, "topic": "Technology", "section": "Forms" },	"Organic farming": { "level": 4, "topic": "Technology", "section": "Forms" },	"Open-source software": { "level": 4, "topic": "Technology", "section": "Computer software" },	"Operating system": { "level": 4, "topic": "Technology", "section": "Operating systems" },	"Optical disc": { "level": 4, "topic": "Technology", "section": "Data storage" },	"Object-oriented programming": { "level": 4, "topic": "Technology", "section": "Programming" },	"Oscilloscope": { "level": 4, "topic": "Technology", "section": "Basics_4" },	"Oil refinery": { "level": 4, "topic": "Technology", "section": "Energy and fuel" },	"Oil well": { "level": 4, "topic": "Technology", "section": "Energy and fuel" },	"Office": { "level": 4, "topic": "Technology", "section": "Commercial buildings" },	"Optical fiber": { "level": 4, "topic": "Technology", "section": "Basics_9" },	"Optical microscope": { "level": 4, "topic": "Technology", "section": "Optical instruments" },	"Optical telescope": { "level": 4, "topic": "Technology", "section": "Optical instruments" },	"Ostankino Tower": { "level": 5, "topic": "Arts", "section": "Europe" },	"Oslo Opera House": { "level": 5, "topic": "Arts", "section": "Europe" },	"Opera house": { "level": 5, "topic": "Arts", "section": "Cultural venues" },	"On the Soul": { "level": 5, "topic": "Arts", "section": "Nonfiction of antiquity" },	"Opticks": { "level": 5, "topic": "Arts", "section": "Nonfiction of early printed book era" },	"Orientalism (book)": { "level": 5, "topic": "Arts", "section": "General nonfiction" },	"Orthodoxy (book)": { "level": 5, "topic": "Arts", "section": "General nonfiction" },	"Out of Africa": { "level": 5, "topic": "Arts", "section": "Biographies and memoirs" },	"On Liberty": { "level": 5, "topic": "Arts", "section": "Essays" },	"Oedipus at Colonus": { "level": 5, "topic": "Arts", "section": "Fiction of antiquity" },	"Oblomov": { "level": 5, "topic": "Arts", "section": "19th century fiction" },	"Oliver Twist": { "level": 5, "topic": "Arts", "section": "19th century fiction" },	"Of Human Bondage": { "level": 5, "topic": "Arts", "section": "Literary fiction" },	"Of Mice and Men": { "level": 5, "topic": "Arts", "section": "Literary fiction" },	"One Flew Over the Cuckoo's Nest (novel)": { "level": 5, "topic": "Arts", "section": "Literary fiction" },	"Orlando: A Biography": { "level": 5, "topic": "Arts", "section": "Historical fiction" },	"Outlander (novel)": { "level": 5, "topic": "Arts", "section": "Romance novels" },	"Odes (Horace)": { "level": 5, "topic": "Arts", "section": "Poetic works of antiquity" },	"Olympian 1": { "level": 5, "topic": "Arts", "section": "Poetic works of antiquity" },	"Orlando Furioso": { "level": 5, "topic": "Arts", "section": "Poetic works of early printed book era" },	"Os Lusíadas": { "level": 5, "topic": "Arts", "section": "Poetic works of early printed book era" },	"O Captain! My Captain!": { "level": 5, "topic": "Arts", "section": "Poetic works of modern era" },	"Omeros": { "level": 5, "topic": "Arts", "section": "Poetic works of modern era" },	"Ozymandias": { "level": 5, "topic": "Arts", "section": "Poetic works of modern era" },	"Orchestration": { "level": 5, "topic": "Arts", "section": "Basics_3" },	"Ornament (music)": { "level": 5, "topic": "Arts", "section": "Musical notation" },	"Oratorio": { "level": 5, "topic": "Arts", "section": "Basic forms" },	"Overture": { "level": 5, "topic": "Arts", "section": "Basic forms" },	"Ocarina": { "level": 5, "topic": "Arts", "section": "Wind instruments" },	"O Tannenbaum": { "level": 5, "topic": "Arts", "section": "Christmas carols" },	"Orpheus in the Underworld": { "level": 5, "topic": "Arts", "section": "Opera" },	"Otello": { "level": 5, "topic": "Arts", "section": "Opera" },	"Oklahoma!": { "level": 5, "topic": "Arts", "section": "Musicals" },	"Ol' Man River": { "level": 5, "topic": "Arts", "section": "Musicals" },	"O Canada": { "level": 5, "topic": "Arts", "section": "Anthems and patriotic songs" },	"Oh! Susanna": { "level": 5, "topic": "Arts", "section": "Folk" },	"OK Computer": { "level": 5, "topic": "Arts", "section": "Rock_2" },	"Over the Rainbow": { "level": 5, "topic": "Arts", "section": "Film, television and video game music" },	"Operetta": { "level": 5, "topic": "Arts", "section": "Musical theatre" },	"Ottonian art": { "level": 5, "topic": "Arts", "section": "Medieval art" },	"Op art": { "level": 5, "topic": "Arts", "section": "Modern art" },	"Orientalism": { "level": 5, "topic": "Arts", "section": "Modern art" },	"Oceanian art": { "level": 5, "topic": "Arts", "section": "Non-Western art traditions" },	"Obelisk": { "level": 5, "topic": "Arts", "section": "Sculpture" },	"Olympia (Manet)": { "level": 5, "topic": "Arts", "section": "Modern" },	"Ophelia (painting)": { "level": 5, "topic": "Arts", "section": "Modern" },	"Oldboy (2003 film)": { "level": 5, "topic": "Arts", "section": "Action" },	"Ordet": { "level": 5, "topic": "Arts", "section": "Art film" },	"Olympia (1938 film)": { "level": 5, "topic": "Arts", "section": "Documentary" },	"On the Waterfront": { "level": 5, "topic": "Arts", "section": "Drama film" },	"One Flew Over the Cuckoo's Nest (film)": { "level": 5, "topic": "Arts", "section": "Drama film" },	"Once Upon a Time in the West": { "level": 5, "topic": "Arts", "section": "Western" },	"Oriental Shorthair": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Cats" },	"Oxyaenidae": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Mammals: General" },	"Ocelot": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Felines" },	"Oryx": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Bovidae" },	"Odobenocetops": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Cetaceans" },	"Oceanic dolphin": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Toothed whale" },	"Okapi": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Giraffidae" },	"Onager": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Equidae" },	"Octodon": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Rodents" },	"Old World porcupine": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Rodents" },	"Oriental giant squirrel": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Rodents" },	"Oilbird": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Caprimulgiformes and related" },	"Owlet-nightjar": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Caprimulgiformes and related" },	"Oystercatcher": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Charadriiformes" },	"Oriental pied hornbill": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Coraciiformes" },	"Ocellated turkey": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Galliformes" },	"Old World quail": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Quails" },	"Old World oriole": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Passerida" },	"Oxpecker": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Passerida" },	"Old World warbler": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Passerida" },	"Oriental garden lizard": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Iguania" },	"Ornithischia": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Ornitischians" },	"Ornithopoda": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Ornitischians" },	"Ornithomimosauria": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Theropods" },	"Ornithomimus": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Theropods" },	"Oviraptor": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Theropods" },	"Ornithocheirus": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Pterosaurs" },	"Ophthalmosaurus": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Prehistoric marine reptiles" },	"Olm": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Salamanders and newts" },	"Opah": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Lampriformes" },	"Osteoglossiformes": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Osteoglossiformes" },	"Oncorhynchus": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Salmoniformes" },	"Ostraciidae": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Tetraodontiformes" },	"Osteolepis": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Prehistoric osteichthyans" },	"Opiliones": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Arachnids" },	"Orb-weaver spider": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Spiders" },	"Oriental rat flea": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Insects: General" },	"Ochetellus glaber": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Hymenoptera" },	"Opabinia": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Fossil arthropods" },	"Orthoceras": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Cephalopods" },	"Onychophora": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Ecdysozoa" },	"Orthonectida": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Spiralia" },	"Oligochaeta": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Lophotrochozoa" },	"Ottoia": { "level": 5, "topic": "Biology and health sciences", "sublist": "Animals", "section": "Lophotrochozoa" },	"Organic matter": { "level": 5, "topic": "Biology and health sciences", "sublist": "Biology", "section": "Biology basics" },	"Order (biology)": { "level": 5, "topic": "Biology and health sciences", "sublist": "Biology", "section": "Biology basics" },	"Organ system": { "level": 5, "topic": "Biology and health sciences", "sublist": "Biology", "section": "Basic anatomy" },	"Occipital lobe": { "level": 5, "topic": "Biology and health sciences", "sublist": "Biology", "section": "Nervous system" },	"Ossicles": { "level": 5, "topic": "Biology and health sciences", "sublist": "Biology", "section": "Nervous system" },	"Optic nerve": { "level": 5, "topic": "Biology and health sciences", "sublist": "Biology", "section": "Nervous system" },	"Osmoregulation": { "level": 5, "topic": "Biology and health sciences", "sublist": "Biology", "section": "Basics" },	"Oogenesis": { "level": 5, "topic": "Biology and health sciences", "sublist": "Biology", "section": "Animal reproduction" },	"Ovulation": { "level": 5, "topic": "Biology and health sciences", "sublist": "Biology", "section": "Human reproduction" },	"Oogonium": { "level": 5, "topic": "Biology and health sciences", "sublist": "Biology", "section": "Plant reproduction" },	"Omega-3 fatty acid": { "level": 5, "topic": "Biology and health sciences", "sublist": "Biology", "section": "Lipids" },	"Omega-6 fatty acid": { "level": 5, "topic": "Biology and health sciences", "sublist": "Biology", "section": "Lipids" },	"Operon": { "level": 5, "topic": "Biology and health sciences", "sublist": "Biology", "section": "Molecular biology" },	"Ornithology": { "level": 5, "topic": "Biology and health sciences", "sublist": "Biology", "section": "Basics_2" },	"Omnivore": { "level": 5, "topic": "Biology and health sciences", "sublist": "Biology", "section": "Ethology" },	"Oxidative phosphorylation": { "level": 5, "topic": "Biology and health sciences", "sublist": "Biology", "section": "Cell processes" },	"Orrorin": { "level": 5, "topic": "Biology and health sciences", "sublist": "Biology", "section": "Australopithecines" },	"Operating theater": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Health facilities" },	"Orthopedic cast": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Treatments" },	"Oxygen therapy": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Treatments" },	"Occupational therapy": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Therapy" },	"Oral rehydration therapy": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Therapy" },	"Osteopathy": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Fields of medicine" },	"Orthodontics": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Fields of medicine" },	"Occupational medicine": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Fields of medicine" },	"Orthopedic surgery": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Fields of medicine" },	"Orthotics": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Fields of medicine" },	"Obstetrics": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Fields of medicine" },	"Oral administration": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "General concepts_2" },	"Oseltamivir": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Antiviral drugs" },	"Opioid": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Pain treatments" },	"Oxycodone": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Pain treatments" },	"Osteoarthritis": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Disease" },	"Osteoporosis": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Disease" },	"Open fracture": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Types" },	"Obstructive shock": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Types" },	"Opportunistic infection": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Concepts" },	"Otitis": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Concepts" },	"Otitis externa": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Concepts" },	"Otitis media": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Concepts" },	"Orthomyxoviridae": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Specific viruses" },	"Onychomycosis": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Fungal infections" },	"Onchocerciasis": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Parasitic infections" },	"Obsessive–compulsive disorder": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Mental disorders" },	"Oppositional defiant disorder": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Mental disorders" },	"Obsessive–compulsive personality disorder": { "level": 5, "topic": "Biology and health sciences", "sublist": "Health", "section": "Mental disorders" },	"Ophioglossidae": { "level": 5, "topic": "Biology and health sciences", "sublist": "Plants", "section": "Ferns" },	"Old Tjikko": { "level": 5, "topic": "Biology and health sciences", "sublist": "Plants", "section": "Pinophyta (Conifers)" },	"Oryza": { "level": 5, "topic": "Biology and health sciences", "sublist": "Plants", "section": "Poales" },	"Opuntia": { "level": 5, "topic": "Biology and health sciences", "sublist": "Plants", "section": "Other culinary fruits" },	"Oryza glaberrima": { "level": 5, "topic": "Biology and health sciences", "sublist": "Plants", "section": "Grains" },	"Ocimum tenuiflorum": { "level": 5, "topic": "Biology and health sciences", "sublist": "Plants", "section": "Herbs and spices" },	"Oregano": { "level": 5, "topic": "Biology and health sciences", "sublist": "Plants", "section": "Herbs and spices" },	"Oakmoss": { "level": 5, "topic": "Biology and health sciences", "sublist": "Plants", "section": "Lichens" },	"Opisthokont": { "level": 5, "topic": "Biology and health sciences", "sublist": "Plants", "section": "Eukaryotes" },	"Oomycete": { "level": 5, "topic": "Biology and health sciences", "sublist": "Plants", "section": "Chromalveolata" },	"One-piece swimsuit": { "level": 5, "topic": "Everyday life", "section": "Clothes: General" },	"Overcoat": { "level": 5, "topic": "Everyday life", "section": "Outerwear" },	"Olive oil": { "level": 5, "topic": "Everyday life", "section": "Cooking oils" },	"Omelette": { "level": 5, "topic": "Everyday life", "section": "Meat and other animal products" },	"Octopus as food": { "level": 5, "topic": "Everyday life", "section": "Seafood" },	"Oat milk": { "level": 5, "topic": "Everyday life", "section": "Dairy analogues" },	"Oyster sauce": { "level": 5, "topic": "Everyday life", "section": "Specific" },	"Onion ring": { "level": 5, "topic": "Everyday life", "section": "Food types" },	"Okonomiyaki": { "level": 5, "topic": "Everyday life", "section": "Food types" },	"Oladyi": { "level": 5, "topic": "Everyday life", "section": "Food types" },	"Oatmeal": { "level": 5, "topic": "Everyday life", "section": "Food types" },	"Orange juice": { "level": 5, "topic": "Everyday life", "section": "Cold drinks" },	"Oolong": { "level": 5, "topic": "Everyday life", "section": "Hot drinks" },	"Only child": { "level": 5, "topic": "Everyday life", "section": "First-degree relatives" },	"Ottoman (furniture)": { "level": 5, "topic": "Everyday life", "section": "Furniture and interior design" },	"Owner's manual": { "level": 5, "topic": "Everyday life", "section": "Furniture and interior design" },	"One-night stand": { "level": 5, "topic": "Everyday life", "section": "Sexuality and gender" },	"Obstacle course": { "level": 5, "topic": "Everyday life", "sublist": "Sports, games and recreation", "section": "Recreation and tourism" },	"Outdoor recreation": { "level": 5, "topic": "Everyday life", "sublist": "Sports, games and recreation", "section": "Recreation and tourism" },	"Open world": { "level": 5, "topic": "Everyday life", "sublist": "Sports, games and recreation", "section": "General video game topics" },	"Online game": { "level": 5, "topic": "Everyday life", "sublist": "Sports, games and recreation", "section": "General video game topics" },	"One Day International": { "level": 5, "topic": "Everyday life", "sublist": "Sports, games and recreation", "section": "Team sports" },	"Off-road racing": { "level": 5, "topic": "Everyday life", "sublist": "Sports, games and recreation", "section": "Motor racing" },	"Offshore powerboat racing": { "level": 5, "topic": "Everyday life", "sublist": "Sports, games and recreation", "section": "Powerboat racing" },	"Oujda": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "Morocco" },	"Osogbo": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "Nigeria" },	"Owerri": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "Nigeria" },	"Oyo, Oyo State": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "Nigeria" },	"Orlando, Florida": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "South" },	"Oklahoma City": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "South" },	"Omaha, Nebraska": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "Midwest" },	"Oakland, California": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "West" },	"Olympia, Washington": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "West" },	"Oaxaca City": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "Mexico" },	"Oruro": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "Bolivia" },	"Oral, Kazakhstan": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "Kazakhstan" },	"Oskemen": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "Kazakhstan" },	"Osh": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "Kyrgyzstan" },	"Okazaki, Aichi": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "Chūbu" },	"Okayama": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "Chūgoku" },	"Okara, Pakistan": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "Pakistan" },	"Olongapo": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "Luzon" },	"Old City of Jerusalem": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "Israel" },	"Ostrava": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "Czech Republic" },	"Olsztyn": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "Poland" },	"Orenburg": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "Volga" },	"Odense": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "Denmark" },	"Oulu": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "Finland" },	"Orléans": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "France" },	"Oberhausen": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "Germany" },	"Oxford": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "England" },	"Oviedo": { "level": 5, "topic": "Geography", "sublist": "Cities", "section": "Spain" },	"Oromia": { "level": 5, "topic": "Geography", "sublist": "Countries", "section": "Ethiopia" },	"Ogun State": { "level": 5, "topic": "Geography", "sublist": "Countries", "section": "Nigeria" },	"Ondo State": { "level": 5, "topic": "Geography", "sublist": "Countries", "section": "Nigeria" },	"Osun State": { "level": 5, "topic": "Geography", "sublist": "Countries", "section": "Nigeria" },	"Oyo State": { "level": 5, "topic": "Geography", "sublist": "Countries", "section": "Nigeria" },	"Orient": { "level": 5, "topic": "Geography", "sublist": "Countries", "section": "Asia: General" },	"Odisha": { "level": 5, "topic": "Geography", "sublist": "Countries", "section": "India" },	"Okayama Prefecture": { "level": 5, "topic": "Geography", "sublist": "Countries", "section": "Japan" },	"Osaka Prefecture": { "level": 5, "topic": "Geography", "sublist": "Countries", "section": "Japan" },	"Okinawa Prefecture": { "level": 5, "topic": "Geography", "sublist": "Countries", "section": "Japan" },	"Overseas France": { "level": 5, "topic": "Geography", "sublist": "Countries", "section": "France" },	"Occitania": { "level": 5, "topic": "Geography", "sublist": "Countries", "section": "France" },	"Overijssel": { "level": 5, "topic": "Geography", "sublist": "Countries", "section": "Netherlands" },	"Opole Voivodeship": { "level": 5, "topic": "Geography", "sublist": "Countries", "section": "Poland" },	"Oblasts of Ukraine": { "level": 5, "topic": "Geography", "sublist": "Countries", "section": "Ukraine" },	"Odesa Oblast": { "level": 5, "topic": "Geography", "sublist": "Countries", "section": "Ukraine" },	"Oxfordshire": { "level": 5, "topic": "Geography", "sublist": "Countries", "section": "United Kingdom" },	"Oaxaca": { "level": 5, "topic": "Geography", "sublist": "Countries", "section": "Mexico" },	"Oklahoma": { "level": 5, "topic": "Geography", "sublist": "Countries", "section": "United States" },	"Ohio": { "level": 5, "topic": "Geography", "sublist": "Countries", "section": "United States" },	"Oregon": { "level": 5, "topic": "Geography", "sublist": "Countries", "section": "United States" },	"Otago": { "level": 5, "topic": "Geography", "sublist": "Countries", "section": "New Zealand" },	"O'Higgins Region": { "level": 5, "topic": "Geography", "sublist": "Countries", "section": "Chile" },	"Ogooué River": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "Africa_2" },	"Okavango River": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "Africa_2" },	"Omo River": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "Africa_2" },	"Oum Er-Rbia River": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "Africa_2" },	"Orontes River": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "Western Asia" },	"Oder": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "Europe_2" },	"Oka (river)": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "Europe_2" },	"Ottawa River": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "Canada" },	"Oder–Havel Canal": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "Canals" },	"Ogallala Aquifer": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "Aquifers" },	"Old Faithful": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "Geysers and hot springs" },	"Okavango Delta": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "River deltas" },	"Okinawa Island": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "Japan" },	"October Revolution Island": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "Arctic" },	"Outer Hebrides": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "British Isles" },	"Orkney": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "British Isles" },	"Ometepe": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "North and Central America: General" },	"Outer Banks": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "United States_2" },	"Oahu": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "Oceania_3" },	"Ontong Java Atoll": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "Oceania_3" },	"Olympic Peninsula": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "Americas" },	"Oga Peninsula": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "Asia_4" },	"Oshima Peninsula": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "Asia_4" },	"Ozarks": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "North America_3" },	"Olympic Mountains": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "North America_3" },	"Ordesa Valley": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "Europe_5" },	"Ojos del Salado": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "South America_5" },	"Optymistychna Cave": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "Caves" },	"Old Man of Hoy": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "Cliffs, headlands, stacks and natural arches" },	"Okapi Wildlife Reserve": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "Africa_7" },	"Olympic National Park": { "level": 5, "topic": "Geography", "sublist": "Physical", "section": "North America_4" },	"Oral history": { "level": 5, "topic": "History", "section": "Basics: General" },	"Ostia Antica": { "level": 5, "topic": "History", "section": "Europe_3" },	"Overthrow of the Roman monarchy": { "level": 5, "topic": "History", "section": "Europe_4" },	"Optimates and populares": { "level": 5, "topic": "History", "section": "Europe_4" },	"Ostrogoths": { "level": 5, "topic": "History", "section": "Europe_4" },	"Ottonian dynasty": { "level": 5, "topic": "History", "section": "Western Europe" },	"Old Prussians": { "level": 5, "topic": "History", "section": "Western Europe" },	"Ostrogothic Kingdom": { "level": 5, "topic": "History", "section": "Italy" },	"Order of Assassins": { "level": 5, "topic": "History", "section": "Western Asia_2" },	"Ottoman–Mamluk War (1516–1517)": { "level": 5, "topic": "History", "section": "Western Asia_2" },	"Ottoman–Persian Wars": { "level": 5, "topic": "History", "section": "Western Asia_2" },	"Oddiyana": { "level": 5, "topic": "History", "section": "Central Asia and Iran" },	"Old Swiss Confederacy": { "level": 5, "topic": "History", "section": "Western Europe_2" },	"Oprichnina": { "level": 5, "topic": "History", "section": "Eastern Europe and Central" },	"Oromo expansion": { "level": 5, "topic": "History", "section": "Africa_6" },	"Ottoman Tripolitania": { "level": 5, "topic": "History", "section": "Africa_6" },	"Oudh State": { "level": 5, "topic": "History", "section": "Southern Asia_3" },	"Ottoman entry into World War I": { "level": 5, "topic": "History", "section": "World War I"	}, "Operation Barbarossa": { "level": 5, "topic": "History", "section": "World War II" },	"Operation Bagration": { "level": 5, "topic": "History", "section": "World War II" },	"Operation Reinhard": { "level": 5, "topic": "History", "section": "World War II" },	"Operation Torch": { "level": 5, "topic": "History", "section": "World War II" },	"Oder–Neisse line": { "level": 5, "topic": "History", "section": "World War II" },	"Operation Market Garden": { "level": 5, "topic": "History", "section": "World War II" },	"Operation Weserübung": { "level": 5, "topic": "History", "section": "World War II" },	"Occupation of the Baltic states": { "level": 5, "topic": "History", "section": "Europe_7" },	"October Revolution": { "level": 5, "topic": "History", "section": "Europe_7" },	"Oregon boundary dispute": { "level": 5, "topic": "History", "section": "United States_2" },	"Oregon Trail": { "level": 5, "topic": "History", "section": "United States_2" },	"Origins of the American Civil War": { "level": 5, "topic": "History", "section": "American Civil War" },	"Overland Campaign": { "level": 5, "topic": "History", "section": "Battles" },	"Orange Free State": { "level": 5, "topic": "History", "section": "Africa_7" },	"Omani Empire": { "level": 5, "topic": "History", "section": "Western Asia_3" },	"Overthrow of the Hawaiian Kingdom": { "level": 5, "topic": "History", "section": "Oceania_7" },	"Occupy movement": { "level": 5, "topic": "History", "section": "Contemporary: General" },	"Occupation of Japan": { "level": 5, "topic": "History", "section": "Contemporary: General" },	"Operation Enduring Freedom – Philippines": { "level": 5, "topic": "History", "section": "Contemporary: General" },	"Ogaden War": { "level": 5, "topic": "History", "section": "Africa_8" },	"Operation Linda Nchi": { "level": 5, "topic": "History", "section": "Africa_8" },	"Operation Uphold Democracy": { "level": 5, "topic": "History", "section": "North America_3" },	"Occupy Wall Street": { "level": 5, "topic": "History", "section": "United States_3" },	"Oklahoma City bombing": { "level": 5, "topic": "History", "section": "United States_3" },	"Operation Car Wash": { "level": 5, "topic": "History", "section": "South America_3" },	"One country, two systems": { "level": 5, "topic": "History", "section": "China" },	"Occupation of the Gaza Strip by the United Arab Republic": { "level": 5, "topic": "History", "section": "West Asia" },	"Orange Revolution": { "level": 5, "topic": "History", "section": "Eastern Europe" },	"One half": { "level": 5, "topic": "Mathematics", "section": "Basics" },	"Operation (mathematics)": { "level": 5, "topic": "Mathematics", "section": "Basics" },	"One-dimensional space": { "level": 5, "topic": "Mathematics", "section": "Geometry: General" },	"Octagon": { "level": 5, "topic": "Mathematics", "section": "Two-dimensional space" },	"Octahedron": { "level": 5, "topic": "Mathematics", "section": "Three-dimensional space" },	"Orientability": { "level": 5, "topic": "Mathematics", "section": "Topology" },	"Operator theory": { "level": 5, "topic": "Mathematics", "section": "Linear algebra" },	"Operator (mathematics)": { "level": 5, "topic": "Mathematics", "section": "Linear algebra" },	"Outcome (probability)": { "level": 5, "topic": "Mathematics", "section": "Probability" },	"Ordered pair": { "level": 5, "topic": "Mathematics", "section": "Set theory" },	"Ordinal number": { "level": 5, "topic": "Mathematics", "section": "Set theory" },	"Oracle machine": { "level": 5, "topic": "Mathematics", "section": "Computability theory" },	"Opposite category": { "level": 5, "topic": "Mathematics", "section": "Category theory" },	"Order theory": { "level": 5, "topic": "Mathematics", "section": "Order theory" },	"Otto Dix": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Modern era" },	"Odilon Redon": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Modern era" },	"Ossip Zadkine": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Sculptors" },	"Otto Wagner": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Architects" },	"Ole Kirk Christiansen": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Board game and toy designers" },	"Orry-Kelly": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Fashion" },	"Oscar de la Renta": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Fashion" },	"Olafur Eliasson": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Contemporary art: General" },	"Ogata Kenzan": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Pottery" },	"Orville Gibson": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Instrument makers" },	"Osman Waqialla": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "African" },	"Ouyang Xun": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Chinese" },	"Ogata Kōrin": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Japanese" },	"Orlando di Lasso": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Medieval and Renaissance" },	"Orlando Gibbons": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Baroque" },	"Oliver Knussen": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "20th century modern" },	"Olivier Messiaen": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "20th century modern" },	"Ottorino Respighi": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "20th century modern" },	"Otto Klemperer": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Conductors" },	"Ornette Coleman": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Jazz and related genres" },	"Original Dixieland Jass Band": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Jazz and related genres" },	"Oscar Peterson": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Jazz and related genres" },	"Olivia Newton-John": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Popular music: General" },	"One Direction": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Popular music: General" },	"Odetta": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Folk" },	"Ofra Haza": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Hebrew" },	"O-Zone": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Romanian \u0026amp; Moldavian" },	"Oliver Mtukudzi": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "African popular music" },	"Oumou Sangaré": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "African popular music" },	"Otis Redding": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Blues, R\u0026amp;B, Funk, Zydeco and Soul" },	"Oasis (band)": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Alternative rock" },	"Ozzy Osbourne": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Heavy metal and hard rock" },	"Outkast": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Hip-hop and rap" },	"O. P. Nayyar": { "level": 5, "topic": "People", "sublist": "Artists, musicians, and composers", "section": "Musical theatre and film" },	"Omar Sharif": { "level": 5, "topic": "People", "sublist": "Entertainers, directors, producers, and screenwriters", "section": "Africa" },	"OC Ukeje": { "level": 5, "topic": "People", "sublist": "Entertainers, directors, producers, and screenwriters", "section": "Africa" },	"Ossie Davis": { "level": 5, "topic": "People", "sublist": "Entertainers, directors, producers, and screenwriters", "section": "United States" },	"Omar Sy": { "level": 5, "topic": "People", "sublist": "Entertainers, directors, producers, and screenwriters", "section": "Europe" },	"Oleg Yankovsky": { "level": 5, "topic": "People", "sublist": "Entertainers, directors, producers, and screenwriters", "section": "Europe" },	"Omotola Jalade Ekeinde": { "level": 5, "topic": "People", "sublist": "Entertainers, directors, producers, and screenwriters", "section": "Africa_2" },	"Olympia Dukakis": { "level": 5, "topic": "People", "sublist": "Entertainers, directors, producers, and screenwriters", "section": "United States_2" },	"Olivia de Havilland": { "level": 5, "topic": "People", "sublist": "Entertainers, directors, producers, and screenwriters", "section": "United States_2" },	"Octavia Spencer": { "level": 5, "topic": "People", "sublist": "Entertainers, directors, producers, and screenwriters", "section": "United States_2" },	"Olive Thomas": { "level": 5, "topic": "People", "sublist": "Entertainers, directors, producers, and screenwriters", "section": "United States_2" },	"Olga Chekhova": { "level": 5, "topic": "People", "sublist": "Entertainers, directors, producers, and screenwriters", "section": "Europe_2" },	"Olivia Colman": { "level": 5, "topic": "People", "sublist": "Entertainers, directors, producers, and screenwriters", "section": "Europe_2" },	"Oumarou Ganda": { "level": 5, "topic": "People", "sublist": "Entertainers, directors, producers, and screenwriters", "section": "Africa_3" },	"Otto Preminger": { "level": 5, "topic": "People", "sublist": "Entertainers, directors, producers, and screenwriters", "section": "United States_3" },	"Oliver Stone": { "level": 5, "topic": "People", "sublist": "Entertainers, directors, producers, and screenwriters", "section": "United States_3" },	"Olga Spessivtseva": { "level": 5, "topic": "People", "sublist": "Entertainers, directors, producers, and screenwriters", "section": "Ballet" },	"Oliver Hardy": { "level": 5, "topic": "People", "sublist": "Entertainers, directors, producers, and screenwriters", "section": "Film_4" },	"Oleg Popov": { "level": 5, "topic": "People", "sublist": "Entertainers, directors, producers, and screenwriters", "section": "Circus" },	"Omar Bradley": { "level": 5, "topic": "People", "sublist": "Military personnel, revolutionaries, and activists", "section": "United States_2" },	"Oliver North": { "level": 5, "topic": "People", "sublist": "Military personnel, revolutionaries, and activists", "section": "United States_2" },	"Oliver Hazard Perry": { "level": 5, "topic": "People", "sublist": "Military personnel, revolutionaries, and activists", "section": "United States_2" },	"Otto Carius": { "level": 5, "topic": "People", "sublist": "Military personnel, revolutionaries, and activists", "section": "Germany" },	"Otto Skorzeny": { "level": 5, "topic": "People", "sublist": "Military personnel, revolutionaries, and activists", "section": "Germany" },	"Olympe de Gouges": { "level": 5, "topic": "People", "sublist": "Military personnel, revolutionaries, and activists", "section": "France_3" },	"Oskar Schindler": { "level": 5, "topic": "People", "sublist": "Military personnel, revolutionaries, and activists", "section": "Europe_3" },	"Oscar F. Mayer": { "level": 5, "topic": "People", "sublist": "Miscellaneous", "section": "Food and drink" },	"Owen D. Young": { "level": 5, "topic": "People", "sublist": "Miscellaneous", "section": "Media and communication" },	"Oliver Chace": { "level": 5, "topic": "People", "sublist": "Miscellaneous", "section": "Other" },	"Oskar Dirlewanger": { "level": 5, "topic": "People", "sublist": "Miscellaneous", "section": "Crimes against humanity" },	"Odilo Globocnik": { "level": 5, "topic": "People", "sublist": "Miscellaneous", "section": "Crimes against humanity" },	"Otto Ohlendorf": { "level": 5, "topic": "People", "sublist": "Miscellaneous", "section": "Crimes against humanity" },	"Oleg Nikolaenko": { "level": 5, "topic": "People", "sublist": "Miscellaneous", "section": "Computer crimes" },	"Osiel Cárdenas Guillén": { "level": 5, "topic": "People", "sublist": "Miscellaneous", "section": "Drugs" },	"Omar Mateen": { "level": 5, "topic": "People", "sublist": "Miscellaneous", "section": "Terrorism" },	"Ota Benga": { "level": 5, "topic": "People", "sublist": "Miscellaneous", "section": "Case studies" },	"Otto Warmbier": { "level": 5, "topic": "People", "sublist": "Miscellaneous", "section": "Other_3" },	"Otto Neurath": { "level": 5, "topic": "People", "sublist": "Philosophers, historians, political and social scientists", "section": "Europe" },	"Oswald Spengler": { "level": 5, "topic": "People", "sublist": "Philosophers, historians, political and social scientists", "section": "Europe" },	"Olivier Blanchard": { "level": 5, "topic": "People", "sublist": "Philosophers, historians, political and social scientists", "section": "Economists and business theorists" },	"Oliver Hart (economist)": { "level": 5, "topic": "People", "sublist": "Philosophers, historians, political and social scientists", "section": "Economists and business theorists" },	"Oliver E. Williamson": { "level": 5, "topic": "People", "sublist": "Philosophers, historians, political and social scientists", "section": "Economists and business theorists" },	"Otto Jespersen": { "level": 5, "topic": "People", "sublist": "Philosophers, historians, political and social scientists", "section": "Linguists" },	"O. G. S. Crawford": { "level": 5, "topic": "People", "sublist": "Philosophers, historians, political and social scientists", "section": "Anthropologists and archaeologists" },	"Otto Kallir": { "level": 5, "topic": "People", "sublist": "Philosophers, historians, political and social scientists", "section": "Art historians, theorists and critics" },	"Oscar Browning": { "level": 5, "topic": "People", "sublist": "Philosophers, historians, political and social scientists", "section": "Educators" },	"Oronce Fine": { "level": 5, "topic": "People", "sublist": "Philosophers, historians, political and social scientists", "section": "Human geographers and cartographers" },	"Oliver Wendell Holmes Jr.": { "level": 5, "topic": "People", "sublist": "Philosophers, historians, political and social scientists", "section": "United States" },	"Otto Rank": { "level": 5, "topic": "People", "sublist": "Philosophers, historians, political and social scientists", "section": "Psychologists" },	"Osorkon I": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "Egypt" },	"Onjo of Baekje": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "Korea" },	"Olympias": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "Macedonia" },	"Odoacer": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "Western Europe" },	"Offa of Mercia": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "British Isles" },	"Owain Glyndŵr": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "Wales" },	"Otto II, Holy Roman Emperor": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "Holy Roman Empire" },	"Otto III, Holy Roman Emperor": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "Holy Roman Empire" },	"Otto IV, Holy Roman Emperor": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "Holy Roman Empire" },	"Olaf II of Norway": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "Scandinavia" },	"Ordoño II of León": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "Iberia" },	"Oleg the Wise": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "Russia and Ukraine" },	"Olga of Kiev": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "Russia and Ukraine" },	"Osei Kofi Tutu I": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "Africa_3" },	"Ovonramwen": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "West Africa" },	"Omar Saidou Tall": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "West Africa" },	"Oguri Kozukenosuke": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "Other_5" },	"Otto Strasser": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "Nazi Germany" },	"Oswald Mosley": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "Other_7" },	"Omar al-Bashir": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "Sudan" },	"Omar Bongo": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "Central Africa" },	"Oswaldo López Arellano": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "Honduras_2" },	"Omar Torrijos": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "Panama_2" },	"Owen Arthur": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "Barbados" },	"Omar Ali Saifuddien III": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "Brunei" },	"Olaf Scholz": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "Unified Germany" },	"Olof Palme": { "level": 5, "topic": "People", "sublist": "Politicians and leaders", "section": "Scandinavia_4" },	"Ovadia Yosef": { "level": 5, "topic": "People", "sublist": "Religious figures", "section": "Judaism" },	"Oral Roberts": { "level": 5, "topic": "People", "sublist": "Religious figures", "section": "Modern, 1800-present_2" },	"Otto von Guericke": { "level": 5, "topic": "People", "sublist": "Scientists, inventors, and mathematicians", "section": "Early modern" },	"Owen Chamberlain": { "level": 5, "topic": "People", "sublist": "Scientists, inventors, and mathematicians", "section": "Modern" },	"Oliver Lodge": { "level": 5, "topic": "People", "sublist": "Scientists, inventors, and mathematicians", "section": "Modern" },	"Osborne Reynolds": { "level": 5, "topic": "People", "sublist": "Scientists, inventors, and mathematicians", "section": "Modern" },	"Owen Willans Richardson": { "level": 5, "topic": "People", "sublist": "Scientists, inventors, and mathematicians", "section": "Modern" },	"Otto Stern": { "level": 5, "topic": "People", "sublist": "Scientists, inventors, and mathematicians", "section": "Modern" },	"Othniel Charles Marsh": { "level": 5, "topic": "People", "sublist": "Scientists, inventors, and mathematicians", "section": "Biology" },	"Oliver Sacks": { "level": 5, "topic": "People", "sublist": "Scientists, inventors, and mathematicians", "section": "Medicine" },	"Otto Heinrich Warburg": { "level": 5, "topic": "People", "sublist": "Scientists, inventors, and mathematicians", "section": "Medicine" },	"Ole Worm": { "level": 5, "topic": "People", "sublist": "Scientists, inventors, and mathematicians", "section": "Medicine" },	"Ottomar Anschütz": { "level": 5, "topic": "People", "sublist": "Scientists, inventors, and mathematicians", "section": "Inventors and engineers" },	"Octave Chanute": { "level": 5, "topic": "People", "sublist": "Scientists, inventors, and mathematicians", "section": "Inventors and engineers" },	"Oliver Heaviside": { "level": 5, "topic": "People", "sublist": "Scientists, inventors, and mathematicians", "section": "Inventors and engineers" },	"Otto Lilienthal": { "level": 5, "topic": "People", "sublist": "Scientists, inventors, and mathematicians", "section": "Inventors and engineers" },	"Oliver Winchester": { "level": 5, "topic": "People", "sublist": "Scientists, inventors, and mathematicians", "section": "Inventors and engineers" },	"Olga Gil Medrano": { "level": 5, "topic": "People", "sublist": "Scientists, inventors, and mathematicians", "section": "Modern_2" },	"Oswald Veblen": { "level": 5, "topic": "People", "sublist": "Scientists, inventors, and mathematicians", "section": "Modern_2" },	"Oleg Blokhin": { "level": 5, "topic": "People", "sublist": "Sports figures", "section": "European" },	"Oscar Robertson": { "level": 5, "topic": "People", "sublist": "Sports figures", "section": "Guards" },	"Oscar Schmidt": { "level": 5, "topic": "People", "sublist": "Sports figures", "section": "Non-U.S. men" },	"Otto Graham": { "level": 5, "topic": "People", "sublist": "Sports figures", "section": "Quarterbacks" },	"O. J. Simpson": { "level": 5, "topic": "People", "sublist": "Sports figures", "section": "Running backs" },	"Old Tom Morris": { "level": 5, "topic": "People", "sublist": "Sports figures", "section": "Golf" },	"Oscar Pistorius": { "level": 5, "topic": "People", "sublist": "Sports figures", "section": "Athletics" },	"Oscar De La Hoya": { "level": 5, "topic": "People", "sublist": "Sports figures", "section": "Boxing" },	"Olga Korbut": { "level": 5, "topic": "People", "sublist": "Sports figures", "section": "Gymnastics" },	"Olga Brusnikina": { "level": 5, "topic": "People", "sublist": "Sports figures", "section": "Swimming" },	"Oliver Lang": { "level": 5, "topic": "People", "sublist": "Sports figures", "section": "Paintball" },	"Oliver Goldsmith": { "level": 5, "topic": "People", "sublist": "Writers and journalists", "section": "Europe_3" },	"Octavia E. Butler": { "level": 5, "topic": "People", "sublist": "Writers and journalists", "section": "US and Canada" },	"Orson Scott Card": { "level": 5, "topic": "People", "sublist": "Writers and journalists", "section": "US and Canada" },	"O. Henry": { "level": 5, "topic": "People", "sublist": "Writers and journalists", "section": "US and Canada" },	"Ozaki Kōyō": { "level": 5, "topic": "People", "sublist": "Writers and journalists", "section": "Asia_4" },	"Odysseas Elytis": { "level": 5, "topic": "People", "sublist": "Writers and journalists", "section": "Eastern Europe" },	"Olga Tokarczuk": { "level": 5, "topic": "People", "sublist": "Writers and journalists", "section": "Eastern Europe" },	"Octave Mirbeau": { "level": 5, "topic": "People", "sublist": "Writers and journalists", "section": "Western Europe" },	"Osbert Sitwell": { "level": 5, "topic": "People", "sublist": "Writers and journalists", "section": "UK and Ireland" },	"Olaf Stapledon": { "level": 5, "topic": "People", "sublist": "Writers and journalists", "section": "UK and Ireland" },	"Ono no Komachi": { "level": 5, "topic": "People", "sublist": "Writers and journalists", "section": "Asia_6" },	"Oliver Wendell Holmes Sr.": { "level": 5, "topic": "People", "sublist": "Writers and journalists", "section": "US and Canada_2" },	"Ogden Nash": { "level": 5, "topic": "People", "sublist": "Writers and journalists", "section": "US and Canada_2" },	"Oswald de Andrade": { "level": 5, "topic": "People", "sublist": "Writers and journalists", "section": "Latin America_2" },	"Olavo Bilac": { "level": 5, "topic": "People", "sublist": "Writers and journalists", "section": "Latin America_2" },	"Octavio Paz": { "level": 5, "topic": "People", "sublist": "Writers and journalists", "section": "Latin America_2" },	"Oton Župančič": { "level": 5, "topic": "People", "sublist": "Writers and journalists", "section": "Eastern Europe_2" },	"Olga Bergholz": { "level": 5, "topic": "People", "sublist": "Writers and journalists", "section": "Russia_2" },	"Osip Mandelstam": { "level": 5, "topic": "People", "sublist": "Writers and journalists", "section": "Russia_2" },	"Oodgeroo Noonuccal": { "level": 5, "topic": "People", "sublist": "Writers and journalists", "section": "Oceania_3" },	"Ottavio Rinuccini": { "level": 5, "topic": "People", "sublist": "Writers and journalists", "section": "Librettists" },	"Oriana Fallaci": { "level": 5, "topic": "People", "sublist": "Writers and journalists", "section": "Journalists: General" },	"Other (philosophy)": { "level": 5, "topic": "Philosophy and religion", "section": "Concepts_3" },	"Ontological argument": { "level": 5, "topic": "Philosophy and religion", "section": "Religious philosophy" },	"Objectivism": { "level": 5, "topic": "Philosophy and religion", "section": "Philosophical schools and traditions" },	"Occult": { "level": 5, "topic": "Philosophy and religion", "section": "Basics_2" },	"Oracle": { "level": 5, "topic": "Philosophy and religion", "section": "Practices" },	"Original sin": { "level": 5, "topic": "Philosophy and religion", "section": "Theology" },	"Order of Saint Augustine": { "level": 5, "topic": "Philosophy and religion", "section": "Practices_2" },	"Order of Saint John (Bailiwick of Brandenburg)": { "level": 5, "topic": "Philosophy and religion", "section": "Practices_2" },	"Ora et labora": { "level": 5, "topic": "Philosophy and religion", "section": "Practices_2" },	"Oral Torah": { "level": 5, "topic": "Philosophy and religion", "section": "Judaism" },	"Odinala": { "level": 5, "topic": "Philosophy and religion", "section": "Other religions: General" },	"Orisha": { "level": 5, "topic": "Philosophy and religion", "section": "African mythology" },	"Oshun": { "level": 5, "topic": "Philosophy and religion", "section": "African mythology" },	"Oedipus": { "level": 5, "topic": "Philosophy and religion", "section": "Greek mythological people" },	"Ogre": { "level": 5, "topic": "Philosophy and religion", "section": "Legendary creatures" },	"Orion (mythology)": { "level": 5, "topic": "Philosophy and religion", "section": "Legendary creatures" },	"Oni": { "level": 5, "topic": "Philosophy and religion", "section": "Legendary creatures" },	"Origin of the Moon": { "level": 5, "topic": "Physical sciences", "sublist": "Astronomy", "section": "Solar System" },	"Orbit of the Moon": { "level": 5, "topic": "Physical sciences", "sublist": "Astronomy", "section": "Solar System" },	"Olympus Mons": { "level": 5, "topic": "Physical sciences", "sublist": "Astronomy", "section": "Solar System" },	"Oberon (moon)": { "level": 5, "topic": "Physical sciences", "sublist": "Astronomy", "section": "Solar System" },	"Orcus (dwarf planet)": { "level": 5, "topic": "Physical sciences", "sublist": "Astronomy", "section": "Solar System" },	"Orion Arm": { "level": 5, "topic": "Physical sciences", "sublist": "Astronomy", "section": "Milky Way" },	"Omega Nebula": { "level": 5, "topic": "Physical sciences", "sublist": "Astronomy", "section": "Notable nebulae" },	"Orbital eccentricity": { "level": 5, "topic": "Physical sciences", "sublist": "Astronomy", "section": "Celestial mechanics" },	"Orbital elements": { "level": 5, "topic": "Physical sciences", "sublist": "Astronomy", "section": "Celestial mechanics" },	"Orbital inclination": { "level": 5, "topic": "Physical sciences", "sublist": "Astronomy", "section": "Celestial mechanics" },	"Orbital resonance": { "level": 5, "topic": "Physical sciences", "sublist": "Astronomy", "section": "Orbital mechanics" },	"Orbital station-keeping": { "level": 5, "topic": "Physical sciences", "sublist": "Astronomy", "section": "Orbital mechanics" },	"Oberth effect": { "level": 5, "topic": "Physical sciences", "sublist": "Astronomy", "section": "Orbital mechanics" },	"Orion's Belt": { "level": 5, "topic": "Physical sciences", "sublist": "Astronomy", "section": "Asterism" },	"Octans": { "level": 5, "topic": "Physical sciences", "sublist": "Astronomy", "section": "Other" },	"Ophiuchus": { "level": 5, "topic": "Physical sciences", "sublist": "Astronomy", "section": "Other" },	"Open cluster": { "level": 5, "topic": "Physical sciences", "sublist": "Astronomy", "section": "Stellar astronomy" },	"Observational cosmology": { "level": 5, "topic": "Physical sciences", "sublist": "Astronomy", "section": "Physical cosmology" },	"Open science": { "level": 5, "topic": "Physical sciences", "sublist": "Basics and measurement", "section": "Science basics" },	"Oxgang": { "level": 5, "topic": "Physical sciences", "sublist": "Basics and measurement", "section": "Area" },	"Olympiad": { "level": 5, "topic": "Physical sciences", "sublist": "Basics and measurement", "section": "Time" },	"Octet rule": { "level": 5, "topic": "Physical sciences", "sublist": "Chemistry", "section": "Bonding" },	"Open-chain compound": { "level": 5, "topic": "Physical sciences", "sublist": "Chemistry", "section": "Substance" },	"Octasulfur": { "level": 5, "topic": "Physical sciences", "sublist": "Chemistry", "section": "Group 16" },	"Oganesson": { "level": 5, "topic": "Physical sciences", "sublist": "Chemistry", "section": "Group 18" },	"Organic acid": { "level": 5, "topic": "Physical sciences", "sublist": "Chemistry", "section": "Specific acids" },	"Oxalic acid": { "level": 5, "topic": "Physical sciences", "sublist": "Chemistry", "section": "Specific acids" },	"Oxygen difluoride": { "level": 5, "topic": "Physical sciences", "sublist": "Chemistry", "section": "Covalent oxides" },	"Oil": { "level": 5, "topic": "Physical sciences", "sublist": "Chemistry", "section": "Hydrocarbons" },	"Octane rating": { "level": 5, "topic": "Physical sciences", "sublist": "Chemistry", "section": "Hydrocarbons" },	"Organochlorine chemistry": { "level": 5, "topic": "Physical sciences", "sublist": "Chemistry", "section": "Halocarbons" },	"Oligomer": { "level": 5, "topic": "Physical sciences", "sublist": "Chemistry", "section": "Polymers" },	"Osmium tetroxide": { "level": 5, "topic": "Physical sciences", "sublist": "Chemistry", "section": "Oxide salts" },	"Oxyanion": { "level": 5, "topic": "Physical sciences", "sublist": "Chemistry", "section": "Oxyanionic salts" },	"Organic reaction": { "level": 5, "topic": "Physical sciences", "sublist": "Chemistry", "section": "Organic reactions" },	"Olefin metathesis": { "level": 5, "topic": "Physical sciences", "sublist": "Chemistry", "section": "Organic reactions" },	"Oxidation state": { "level": 5, "topic": "Physical sciences", "sublist": "Chemistry", "section": "Redox reactions" },	"Oxidizing agent": { "level": 5, "topic": "Physical sciences", "sublist": "Chemistry", "section": "Redox reactions" },	"One-pot synthesis": { "level": 5, "topic": "Physical sciences", "sublist": "Chemistry", "section": "Synthetic strategies" },	"Organic synthesis": { "level": 5, "topic": "Physical sciences", "sublist": "Chemistry", "section": "Synthetic strategies" },	"Octahedral molecular geometry": { "level": 5, "topic": "Physical sciences", "sublist": "Chemistry", "section": "Bond structure" },	"Orbital hybridisation": { "level": 5, "topic": "Physical sciences", "sublist": "Chemistry", "section": "Bond structure" },	"Osmotic pressure": { "level": 5, "topic": "Physical sciences", "sublist": "Chemistry", "section": "Thermodynamics" },	"Oxygen cycle": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Earth science basics: General" },	"Overexploitation": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Earth science basics: General" },	"Overfishing": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Earth science basics: General" },	"Outgoing longwave radiation": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Climate change" },	"Ocean acidification": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Climate change" },	"Ozone layer": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Atmosphere: General" },	"Organic geochemistry": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Geochemistry" },	"Ordovician": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Geological timescale" },	"Oligocene": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Geological timescale" },	"Ochre": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Minerals" },	"Oxide mineral": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Minerals" },	"Olivine": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Minerals" },	"Opal": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Minerals" },	"Onyx": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Minerals" },	"Orthoclase": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Minerals" },	"Orpiment": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Minerals" },	"Obsidian": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Petrology" },	"Oolite": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Petrology" },	"Orogeny": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Tectonics" },	"Oceanic crust": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Tectonics" },	"Okhotsk microplate": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Tectonic plates" },	"Oceanic basin": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Oceanic and coastal landforms" },	"Ocean surface ecosystem": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Oceanography" },	"Ocean dynamics": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Oceanography" },	"Ocean surface topography": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Oceanography" },	"Ocean temperature": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Oceanography" },	"Oceanic zone": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Oceanography" },	"Oxbow lake": { "level": 5, "topic": "Physical sciences", "sublist": "Earth science", "section": "Hydrology" },	"Outline of physics": { "level": 5, "topic": "Physical sciences", "sublist": "Physics", "section": "Physics basics: General" },	"Onium": { "level": 5, "topic": "Physical sciences", "sublist": "Physics", "section": "Atomic physics" },	"Oxonium ion": { "level": 5, "topic": "Physical sciences", "sublist": "Physics", "section": "Atomic physics" },	"Optical pumping": { "level": 5, "topic": "Physical sciences", "sublist": "Physics", "section": "Atomic physics" },	"Optical path": { "level": 5, "topic": "Physical sciences", "sublist": "Physics", "section": "Optics" },	"Optical path length": { "level": 5, "topic": "Physical sciences", "sublist": "Physics", "section": "Optics" },	"Opacity": { "level": 5, "topic": "Physical sciences", "sublist": "Physics", "section": "Optics" },	"Optical depth": { "level": 5, "topic": "Physical sciences", "sublist": "Physics", "section": "Optics" },	"Optical power": { "level": 5, "topic": "Physical sciences", "sublist": "Physics", "section": "Optics" },	"Optical coating": { "level": 5, "topic": "Physical sciences", "sublist": "Physics", "section": "Optics" },	"Olive (color)": { "level": 5, "topic": "Physical sciences", "sublist": "Physics", "section": "Colors" },	"Orthorhombic crystal system": { "level": 5, "topic": "Physical sciences", "sublist": "Physics", "section": "Crystallography" },	"Ohmic contact": { "level": 5, "topic": "Physical sciences", "sublist": "Physics", "section": "Electrical circuits" },	"Observable": { "level": 5, "topic": "Physical sciences", "sublist": "Physics", "section": "Quantum mechanics" },	"Operator (physics)": { "level": 5, "topic": "Physical sciences", "sublist": "Physics", "section": "Quantum mechanics" },	"Otto cycle": { "level": 5, "topic": "Physical sciences", "sublist": "Physics", "section": "Thermodynamics" },	"Organizational communication": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Communication" },	"Old World": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Geocultural area" },	"Oktoberfest": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Festivals, holidays, and observances" },	"Obon": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "East Asian holidays" },	"Oral exam": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Education: General" },	"Ohio State University": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Big Ten" },	"Osaka University": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Japan" },	"Ojibwe": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Indigenous people" },	"Overseas Chinese": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "China_2" },	"Origin of speech": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Language: General" },	"Official script": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Spelling" },	"Onomatopoeia": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Vocabulary" },	"Oceanic languages": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Language families" },	"Oto-Manguean languages": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Language families" },	"Ogham": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Alphabets and writing systems" },	"Ojibwe language": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Algic languages" },	"Old French": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Romance languages" },	"Occitan language": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Romance languages" },	"Ossetian language": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Iranian languages" },	"Old Nubian": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Nilo-Saharan languages" },	"Ovambo language": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Niger–Congo languages" },	"Old media": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Mass media" },	"Open access": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Mass media" },	"Online magazine": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Magazines" },	"Out (magazine)": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Specific magazines" },	"One Man's Family": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Programs" },	"Oshin": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Japan_3" },	"Only Fools and Horses": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "United Kingdom_3" },	"One Life to Live": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Soap operas" },	"Orange Is the New Black": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Post-1999" },	"Online shaming": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Internet medium" },	"Online streamer": { "level": 5, "topic": "Society and social sciences", "sublist": "Culture", "section": "Internet medium" },	"Option (finance)": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Securities" },	"Open-pit mining": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Industry" },	"Occupational injury": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Employment" },	"Offshoring": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Employment" },	"Outsourcing": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Employment" },	"Online advertising": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Marketing" },	"Online shopping": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Marketing" },	"Offshore financial centre": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Taxation" },	"Opportunity cost": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Economics_2" },	"Output (economics)": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Economics_2" },	"Oracle Corporation": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Computing, telecommunication, electronics, and software" },	"Oath": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Basics" },	"Oath of office": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Basics" },	"Ostracism": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Punishments" },	"Outlaw": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Punishments" },	"Organic law": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Constitutional law" },	"Offer and acceptance": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Contract law" },	"Outlaw motorcycle club": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Crime" },	"Obstruction of justice in the United States": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Crimes against justice" },	"Offender profiling": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Criminology" },	"Objection (United States law)": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Legal procedure: General" },	"Opening statement": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Legal procedure: General" },	"Ordnance Survey": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "United Kingdom" },	"Organisation of African Unity": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Intergovernmental organizations" },	"Organization of the Black Sea Economic Cooperation": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Intergovernmental organizations" },	"Organisation of Islamic Cooperation": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Intergovernmental organizations" },	"Organisation internationale de la Francophonie": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Non-governmental organizations" },	"Oxfam": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Humanitarian organizations" },	"Ombudsman": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Titles" },	"Oil war": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Wars by type" },	"Operational level of war": { "level": 5, "topic": "Society and social sciences", "sublist": "Politics and economics", "section": "Basics_3" },	"Oedipus complex": { "level": 5, "topic": "Society and social sciences", "sublist": "Social studies", "section": "Concepts" },	"Operant conditioning": { "level": 5, "topic": "Society and social sciences", "sublist": "Social studies", "section": "Concepts" },	"Openness to experience": { "level": 5, "topic": "Society and social sciences", "sublist": "Social studies", "section": "Emotions and traits" },	"Observer status": { "level": 5, "topic": "Society and social sciences", "sublist": "Social studies", "section": "Groups" },	"Otaku": { "level": 5, "topic": "Society and social sciences", "sublist": "Social studies", "section": "Groups" },	"Oppression": { "level": 5, "topic": "Society and social sciences", "sublist": "Social studies", "section": "Discrimination" },	"Olericulture": { "level": 5, "topic": "Technology", "section": "Agriculture_2" },	"Offshore aquaculture": { "level": 5, "topic": "Technology", "section": "Aquaculture" },	"Organic aquaculture": { "level": 5, "topic": "Technology", "section": "Aquaculture" },	"Orangery": { "level": 5, "topic": "Technology", "section": "Buildings and infrastructure" },	"Organ printing": { "level": 5, "topic": "Technology", "section": "Biotechnology" },	"Open source": { "level": 5, "topic": "Technology", "section": "Computing and information technology basics" },	"Optical computing": { "level": 5, "topic": "Technology", "section": "Computer architecture concepts" },	"One-time pad": { "level": 5, "topic": "Technology", "section": "Computer security" },	"Obfuscation (software)": { "level": 5, "topic": "Technology", "section": "Computer security" },	"Office Open XML": { "level": 5, "topic": "Technology", "section": "File format" },	"OpenDocument": { "level": 5, "topic": "Technology", "section": "File format" },	"Ogg": { "level": 5, "topic": "Technology", "section": "File format" },	"Online chat": { "level": 5, "topic": "Technology", "section": "Internet" },	"Online dating": { "level": 5, "topic": "Technology", "section": "Internet" },	"Object code": { "level": 5, "topic": "Technology", "section": "Software development: General" },	"Open Database Connectivity": { "level": 5, "topic": "Technology", "section": "Software development: General" },	"OpenGL": { "level": 5, "topic": "Technology", "section": "Software development: General" },	"Operator overloading": { "level": 5, "topic": "Technology", "section": "Programming languages" },	"Objective-C": { "level": 5, "topic": "Technology", "section": "Programming languages" },	"OLED": { "level": 5, "topic": "Technology", "section": "Other media and communication technology" },	"Operational amplifier": { "level": 5, "topic": "Technology", "section": "Components" },	"OR gate": { "level": 5, "topic": "Technology", "section": "Digital logic" },	"Oil platform": { "level": 5, "topic": "Technology", "section": "Fuel" },	"Oil lamp": { "level": 5, "topic": "Technology", "section": "Lighting" },	"Overhead power line": { "level": 5, "topic": "Technology", "section": "Electricity transmission and distribution" },	"Overhead cable": { "level": 5, "topic": "Technology", "section": "Electricity transmission and distribution" },	"Oxygen mask": { "level": 5, "topic": "Technology", "section": "Food, water and health" },	"Open-end spinning": { "level": 5, "topic": "Technology", "section": "Spinning" },	"Oroville Dam": { "level": 5, "topic": "Technology", "section": "Dams" },	"Optical spectrometer": { "level": 5, "topic": "Technology", "section": "Measuring instruments" },	"Odometer": { "level": 5, "topic": "Technology", "section": "Measuring instruments" },	"Onager (weapon)": { "level": 5, "topic": "Technology", "section": "Artillery" },	"Octant (instrument)": { "level": 5, "topic": "Technology", "section": "Navigation" },	"October": { "level": 5, "topic": "Technology", "section": "Months" },	"One-way mirror": { "level": 5, "topic": "Technology", "section": "Optical components" },	"Optical filter": { "level": 5, "topic": "Technology", "section": "Optical components" },	"Optical isolator": { "level": 5, "topic": "Technology", "section": "Optical components" },	"Orbital spaceflight": { "level": 5, "topic": "Technology", "section": "Basics_5" },	"Opportunity (rover)": { "level": 5, "topic": "Technology", "section": "Rovers" },	"Off-road vehicle": { "level": 5, "topic": "Technology", "section": "Motorized road transport" },	"Outrigger (nautical)": { "level": 5, "topic": "Technology", "section": "Naval transport" },	"Ocean liner": { "level": 5, "topic": "Technology", "section": "Naval transport" },	"Oil tanker": { "level": 5, "topic": "Technology", "section": "Naval transport" },	"O'Hare International Airport": { "level": 5, "topic": "Technology", "section": "North America" },	"Osaka Metro": { "level": 5, "topic": "Technology", "section": "Japan" },	"Oslo Metro": { "level": 5, "topic": "Technology", "section": "Scandinavia" },	"Orient Express": { "level": 5, "topic": "Technology", "section": "Railway services" } }