Wikipedia:WikiProject Portals/Vital portals level 3

The vital portals system follows the vital articles system and is based loosely on powers of ten. At level 3, there are about 1000. The previous level is at WikiProject Portals/Vital portals level 2.

Politicians and leaders (26 portals)

 * Portal:Hammurabi
 * Portal:Hatshepsut
 * Portal:Ramesses II
 * Portal:Cyrus the Great
 * Portal:Pericles
 * Portal:Alexander the Great
 * Portal:Qin Shi Huang
 * Portal:Julius Caesar
 * Portal:Augustus
 * Portal:Charlemagne
 * Portal:Genghis Khan
 * Portal:Joan of Arc
 * Portal:Suleiman the Magnificent
 * Portal:Elizabeth I of England
 * Portal:Catherine the Great
 * Portal:George Washington
 * Portal:Napoleon
 * Portal:Simón Bolívar
 * Portal:Abraham Lincoln
 * Portal:Vladimir Lenin
 * Portal:Mahatma Gandhi
 * Portal:Winston Churchill
 * Portal:Adolf Hitler
 * Portal:Joseph Stalin
 * Portal:Mao Zedong
 * Portal:Nelson Mandela

Religious figures (9 portals)

 * Portal:Abraham
 * Portal:Moses
 * Portal:Laozi
 * Portal:Gautama Buddha
 * Portal:Jesus
 * Portal:Paul the Apostle
 * Portal:Adi Shankara
 * Portal:Muhammad
 * Portal:Martin Luther

Explorers (8 portals)

 * Portal:Marco Polo
 * Portal:Ibn Battuta
 * Portal:Zheng He
 * Portal:Christopher Columbus
 * Portal:Vasco da Gama
 * Portal:Ferdinand Magellan
 * Portal:James Cook
 * Portal:Roald Amundsen

Businessmen (1 article)

 * Portal:Henry Ford

Writers (19 portals)

 * Portal:Homer
 * Portal:Sophocles
 * Portal:Virgil
 * Portal:Li Bai
 * Portal:Murasaki Shikibu
 * Portal:Rumi
 * Portal:Dante Alighieri
 * Portal:Miguel de Cervantes
 * Portal:William Shakespeare
 * Portal:Voltaire
 * Portal:Johann Wolfgang von Goethe
 * Portal:Jane Austen
 * Portal:Edgar Allan Poe
 * Portal:Fyodor Dostoevsky
 * Portal:Leo Tolstoy
 * Portal:James Joyce
 * Portal:Kahlil Gibran
 * Portal:Franz Kafka
 * Portal:Ernest Hemingway

Artists (9 portals)

 * Portal:Leonardo da Vinci
 * Portal:Michelangelo
 * Portal:Rembrandt
 * Portal:Hokusai
 * Portal:Claude Monet
 * Portal:Vincent van Gogh
 * Portal:Salvador Dalí
 * Portal:Pablo Picasso
 * Portal:Frida Kahlo

Composers and musicians (10 portals)

 * Portal:Hildegard of Bingen
 * Portal:Johann Sebastian Bach
 * Portal:Wolfgang Amadeus Mozart
 * Portal:Ludwig van Beethoven
 * Portal:Richard Wagner
 * Portal:Frédéric Chopin
 * Portal:Igor Stravinsky
 * Portal:Louis Armstrong
 * Portal:Elvis Presley
 * Portal:The Beatles

Filmmakers (4 portals)

 * Portal:Charlie Chaplin
 * Portal:Alfred Hitchcock
 * Portal:Walt Disney
 * Portal:Akira Kurosawa

Inventors and scientists (21 portals)

 * Portal:Hippocrates
 * Portal:Jabir ibn Hayyan
 * Portal:Shen Kuo
 * Portal:Johannes Gutenberg
 * Portal:Nicolaus Copernicus
 * Portal:Galileo Galilei
 * Portal:Isaac Newton
 * Portal:Benjamin Franklin
 * Portal:Carl Linnaeus
 * Portal:Antoine Lavoisier
 * Portal:Michael Faraday
 * Portal:Charles Darwin
 * Portal:Louis Pasteur
 * Portal:James Clerk Maxwell
 * Portal:Dmitri Mendeleev
 * Portal:Thomas Edison
 * Portal:Nikola Tesla
 * Portal:Marie Curie
 * Portal:Albert Einstein
 * Portal:Niels Bohr
 * Portal:Werner Heisenberg

Mathematicians (9 portals)

 * Portal:Archimedes
 * Portal:Euclid
 * Portal:Muhammad ibn Musa al-Khwarizmi
 * Portal:Leonhard Euler
 * Portal:Pierre-Simon Laplace
 * Portal:Carl Friedrich Gauss
 * Portal:Emmy Noether
 * Portal:Kurt Gödel
 * Portal:Alan Turing

Philosophers and social scientists (16 portals)

 * Portal:Confucius
 * Portal:Herodotus
 * Portal:Plato
 * Portal:Aristotle
 * Portal:Nagarjuna
 * Portal:Avicenna
 * Portal:Thomas Aquinas
 * Portal:Ibn Khaldun
 * Portal:René Descartes
 * Portal:John Locke
 * Portal:Adam Smith
 * Portal:Immanuel Kant
 * Portal:Karl Marx
 * Portal:Mary Wollstonecraft
 * Portal:Friedrich Nietzsche
 * Portal:Sigmund Freud

General (4 portals)

 * Portal:History (Level 2)
 * Portal:History of the world (Level 1)
 * Portal:Civilization (Level 2)
 * Portal:Archaeology

History by region (9 portals)

 * Portal:History of Africa
 * Portal:History of Asia
 * Portal:History of East Asia
 * Portal:History of India
 * Portal:History of the Middle East
 * Portal:History of Europe
 * Portal:History of North America
 * Portal:History of Oceania
 * Portal:History of South America

History by subject (8 portals)

 * Portal:History of art (Level 2)
 * Portal:History of science (Level 2)
 * Portal:History of agriculture
 * Portal:History of literature
 * Portal:History of mathematics
 * Portal:History of medicine
 * Portal:History of music
 * Portal:History of technology

Prehistory (6 portals)

 * Portal:Prehistory (Level 2)
 * Portal:Stone Age
 * Portal:Early human migrations
 * Portal:Neolithic Revolution
 * Portal:Mesopotamia
 * Portal:Sumer

Ancient history (15 portals)

 * Portal:Ancient history (Level 2)
 * Portal:Bronze Age
 * Portal:Ancient Egypt
 * Portal:Andean civilizations
 * Portal:Assyria
 * Portal:Indus Valley Civilisation
 * Portal:Mesoamerica
 * Portal:Maya civilization
 * Portal:Iron Age
 * Portal:Ancient Greece
 * Portal:Ancient Rome
 * Portal:Achaemenid Empire
 * Portal:Gupta Empire
 * Portal:Han dynasty
 * Portal:Silk Road

Post-classical history (13 portals)

 * Portal:Post-classical history (Level 2)
 * Portal:Aztecs
 * Portal:Inca Empire
 * Portal:Islamic Golden Age
 * Portal:Middle Ages
 * Portal:Black Death
 * Portal:Byzantine Empire
 * Portal:Crusades
 * Portal:Holy Roman Empire
 * Portal:Viking Age
 * Portal:Mongol Empire
 * Portal:Ottoman Empire
 * Portal:Tang dynasty

Modern history (20 portals)

 * Portal:Modern history (Level 2)
 * Portal:Renaissance
 * Portal:Age of Discovery
 * Portal:European colonization of the Americas
 * Portal:Reformation
 * Portal:Mughal Empire
 * Portal:Scientific Revolution
 * Portal:Age of Enlightenment
 * Portal:Industrial Revolution
 * Portal:French Revolution
 * Portal:Abolitionism
 * Portal:Scramble for Africa
 * Portal:British Empire
 * Portal:World War I
 * Portal:Soviet Union
 * Portal:Great Depression
 * Portal:World War II
 * Portal:Cold War
 * Portal:Spaceflight
 * Portal:Moon landing

General (1 article)

 * Portal:Geography (Level 2)

Continents and regions (10 portals)

 * Portal:Continents
 * Portal:Africa (Level 2)
 * Portal:Antarctica
 * Portal:Asia (Level 2)
 * Portal:Europe (Level 2)
 * Portal:North America (Level 2)
 * Portal:South America (Level 2)
 * Regions
 * Portal:Arctic
 * Portal:Middle East
 * Portal:Oceania (Level 2)

Cities (18 portals)

 * Portal:Cities (Level 2)
 * Portal:Beijing
 * Portal:Cairo
 * Portal:Delhi
 * Portal:Hong Kong
 * Portal:Istanbul
 * Portal:Jakarta
 * Portal:Jerusalem
 * Portal:London
 * Portal:Mecca
 * Portal:Mexico City
 * Portal:Moscow
 * Portal:Mumbai
 * Portal:New York City
 * Portal:Paris
 * Portal:Rome
 * Portal:São Paulo
 * Portal:Tokyo

Countries (36 portals)

 * Portal:Countries (Level 2)
 * Portal:Argentina
 * Portal:Australia
 * Portal:Bangladesh
 * Portal:Brazil
 * Portal:Canada
 * Portal:China
 * Portal:Colombia
 * Portal:Democratic Republic of the Congo
 * Portal:Egypt
 * Portal:Ethiopia
 * Portal:France
 * Portal:Germany
 * Portal:India
 * Portal:Indonesia
 * Portal:Iran
 * Portal:Israel
 * Portal:Italy
 * Portal:Japan
 * Portal:Mexico
 * Portal:Nigeria
 * Portal:Pakistan
 * Portal:Philippines
 * Portal:Poland
 * Portal:Russia
 * Portal:Saudi Arabia
 * Portal:Singapore
 * Portal:South Africa
 * Portal:South Korea
 * Portal:Spain
 * Portal:Tanzania
 * Portal:Thailand
 * Portal:Turkey
 * Portal:United Kingdom
 * Portal:United States
 * Portal:Vietnam

Hydrologic features (17 portals)

 * Portal:Oceans
 * Portal:Seas (Level 2)
 * Portal:Arctic Ocean
 * Portal:Atlantic Ocean
 * Portal:Mediterranean Sea
 * Portal:Indian Ocean
 * Portal:Pacific Ocean
 * Portal:Great Barrier Reef
 * Portal:Southern Ocean
 * Portal:Lakes
 * Portal:Caspian Sea
 * Portal:Great Lakes
 * Portal:Lake Victoria
 * Portal:Rivers
 * Portal:Amazon River
 * Portal:Mississippi River
 * Portal:Nile
 * Portal:Yangtze

Terrestrial features (14 portals)

 * Portal:Land (Level 2)
 * Portal:Deserts
 * Portal:Sahara
 * Portal:Islands
 * Portal:Mountains
 * Portal:Alps
 * Portal:Andes
 * Portal:Himalayas
 * Portal:Rocky Mountains
 * Portal:Grand Canyon
 * Portal:Forests
 * Portal:Amazon rainforest
 * Portal:Glaciers

General (2 portals)

 * Portal:The arts (Level 1)
 * Portal:Museums

Artistic movements (4 portals)

 * Portal:Abstract art
 * Portal:Modernism
 * Realism
 * Portal:Romanticism

Architecture (9 portals)

 * Portal:Architecture (Level 2)
 * Portal:Angkor Wat
 * Portal:Colosseum
 * Portal:Great Pyramid of Giza
 * Portal:Great Wall of China
 * Portal:Machu Picchu
 * Portal:Parthenon
 * Portal:Stonehenge
 * Portal:Taj Mahal

Literature (8 portals)

 * Portal:Literature (Level 2)
 * Portal:English literature
 * Portal:Fiction
 * Portal:Novels
 * Portal:Short stories
 * Portal:Fairy tales
 * Portal:Poetry
 * Portal:Epic poetry

Music (8 portals)

 * Portal:Music (Level 2)
 * Portal:Musical instruments
 * Portal:Singing
 * Genres
 * Portal:Classical music
 * Portal:Folk music
 * Portal:Jazz
 * Portal:Pop music
 * Portal:Rock music

Performing arts (6 portals)

 * Portal:Performing arts (Level 2)
 * Portal:Comedy
 * Portal:Dance
 * Portal:Opera
 * Portal:Orchestras
 * Portal:Theatre

Visual arts (10 portals)

 * Portal:Visual arts (Level 2)
 * Portal:Films (Level 2)
 * Portal:Animation
 * Portal:Calligraphy
 * Portal:Comics
 * Portal:Drawing
 * Portal:Painting
 * Portal:Photography
 * Portal:Pottery
 * Portal:Sculpture

Philosophy (21 portals)

 * Portal:Philosophy (Level 2)
 * Portal:Analytic philosophy
 * Portal:Philosophy of science
 * Philosophical branches
 * Portal:Aesthetics
 * Portal:Epistemology
 * Portal:Knowledge (Level 2)
 * Portal:Belief
 * Portal:Reason
 * Portal:Truth
 * Portal:Ethics (Level 2)
 * Portal:Good and evil
 * Portal:Logic (Level 2)
 * Portal:Metaphysics
 * Portal:Existence
 * Portal:Free will
 * Portal:Ontology
 * Philosophy by region and period
 * Portal:Eastern philosophy
 * Portal:Confucianism
 * Portal:Western philosophy
 * Portal:Ancient Greek philosophy
 * Portal:Contemporary philosophy

Religion (14 portals)

 * Portal:Religion (Level 2)
 * Portal:Myths (Level 2)
 * Portal:Afterlife
 * Portal:Atheism
 * Portal:Deities
 * Portal:God
 * Portal:Meditation
 * Portal:New religious movement
 * Portal:Prayers
 * Portal:Rituals
 * Portal:Shamanism
 * Portal:Souls
 * Portal:Spirituality
 * Portal:Western esotericism

Specific religions (22 portals)

 * Portal:Buddhism
 * Portal:Mahayana
 * Portal:Theravada
 * Portal:Christianity
 * Portal:Bible
 * Portal:Catholic Church
 * Portal:Eastern Orthodox Church
 * Portal:Protestantism
 * Portal:Hinduism
 * Portal:Vedas
 * Portal:Bhagavad Gita
 * Portal:Islam
 * Portal:Shia Islam
 * Portal:Sunni Islam
 * Portal:Quran
 * Portal:Jainism
 * Portal:Judaism
 * Portal:Talmud
 * Portal:Shinto
 * Portal:Sikhism
 * Portal:Taoism
 * Portal:Zoroastrianism

General (4 portals)

 * Portal:Clothing (Level 2)
 * Portal:Homes (Level 2)
 * Portal:Furniture
 * Portal:Jewellery

Family and kinship (9 portals)

 * Portal:Ethnic groups (Level 2)
 * Portal:Families (Level 2)
 * Portal:Adults
 * Portal:Adolescence
 * Portal:Children
 * Portal:Infants
 * Portal:Marriage
 * Portal:Parenting
 * Portal:Friendship

Sexuality and gender (5 portals)

 * Portal:Human sexuality (Level 2)
 * Portal:Sexual orientation
 * Portal:Gender
 * Portal:Men
 * Portal:Women

Food and drink (23 portals)

 * Portal:Cooking
 * Portal:Food (Level 2)
 * Portal:Cereals
 * Portal:Wheat
 * Portal:Bread
 * Portal:Maize
 * Portal:Rice
 * Portal:Cheese
 * Portal:Fruit
 * Portal:Meat
 * Portal:Nuts (fruit)
 * Portal:Salt
 * Portal:Spices
 * Portal:Sugar
 * Portal:Vegetables
 * Portal:Potatoes
 * Portal:Soybeans
 * Portal:Drinks
 * Portal:Alcoholic drinks
 * Portal:Coffee
 * Portal:Drinking water
 * Portal:Milk
 * Portal:Tea

Recreation and entertainment (13 portals)

 * Portal:Entertainment (Level 2)
 * Portal:Play (activity)
 * Portal:Games
 * Portal:Board games
 * Portal:Card games
 * Portal:Gambling
 * Portal:Video games
 * Portal:Sports
 * Portal:Association football
 * Portal:Sport of athletics
 * Portal:Olympic Games
 * Portal:Toys
 * Portal:Tourism

General (10 portals)

 * Portal:Culture (Level 1)
 * Portal:Popular culture (Level 2)
 * Portal:Folklore
 * Portal:Community (Level 2)
 * Portal:Society (Level 2)
 * Portal:Social class
 * Portal:Communication (Level 2)
 * Portal:Social science
 * Portal:Anthropology
 * Portal:Sociology

Language (28 portals)

 * Portal:Languages (Level 1)
 * Portal:Indo-European languages
 * English
 * French
 * German
 * Greek
 * Portal:Latin
 * Spanish
 * Portuguese
 * Russian
 * Hindustani
 * Bengali
 * Other languages
 * Portal:Arabic
 * Chinese
 * Japanese
 * Portal:Linguistics
 * Portal:Grammar
 * Portal:Words
 * Portal:Personal names
 * Portal:Speech
 * Portal:Writing (Level 2)
 * Portal:Alphabets
 * Portal:Arabic alphabet
 * Portal:Brahmic scripts
 * Portal:Cyrillic script
 * Portal:Greek alphabet
 * Portal:Latin script
 * Portal:Chinese characters

Psychology (15 portals)

 * Portal:Psychology (Level 2)
 * Portal:Emotions (Level 2)
 * Portal:Anger
 * Portal:Fear
 * Portal:Happiness
 * Portal:Humour
 * Portal:Love
 * Portal:Mind (Level 2)
 * Portal:Consciousness
 * Portal:Dream
 * Portal:Memory
 * Portal:Thought
 * Portal:Human behavior
 * Portal:Learning
 * Portal:Personality

Politics and government (28 portals)

 * Portal:Politics (Level 2)
 * Portal:Political science
 * Portal:Colonialism
 * Portal:Imperialism
 * Portal:Governments (Level 2)
 * Portal:Democracy
 * Portal:Dictatorships
 * Portal:Monarchies
 * Portal:Secularism
 * Portal:Theocracy
 * Portal:Ideology
 * Portal:Anarchism
 * Portal:Communism
 * Portal:Conservatism
 * Portal:Fascism
 * Portal:Liberalism
 * Portal:Nationalism
 * Portal:Socialism
 * State
 * Portal:Diplomacy
 * Portal:Military
 * International organizations
 * Portal:European Union
 * Portal:International Red Cross and Red Crescent Movement
 * Portal:NATO
 * Portal:United Nations
 * Portal:International Monetary Fund
 * Portal:World Health Organization
 * Portal:World Trade Organization

Business and economics (24 portals)

 * Portal:Business (Level 2)
 * Portal:Corporations
 * Portal:Finance
 * Portal:Management
 * Portal:Marketing
 * Portal:Retail
 * Portal:Economics
 * Portal:Employment (Level 2)
 * Portal:Money (Level 2)
 * Portal:Banks
 * Portal:Currency
 * Portal:Capitalism
 * Portal:Macroeconomics
 * Portal:Microeconomics
 * Portal:Supply and demand
 * Portal:Taxes
 * Portal:Trade
 * Portal:Industry (Level 2)
 * Portal:Agriculture (Level 2)
 * Portal:Construction (Level 2)
 * Portal:Manufacturing (Level 2)
 * Portal:Fishing
 * Portal:Hunting
 * Portal:Mining

Social issues (33 portals)

 * Portal:Education (Level 2)
 * Portal:Schools
 * Portal:Libraries
 * Portal:Law (Level 2)
 * Portal:Crime (Level 2)
 * Portal:Constitution
 * Portal:Justice
 * Portal:Police
 * Portal:Property
 * Portal:War (Level 2)
 * Portal:Genocide
 * Portal:Peace
 * Portal:Terrorism
 * Portal:Abortion
 * Portal:Disability
 * Portal:Discrimination
 * Portal:Racism
 * Portal:Sexism
 * Portal:Environmentalism
 * Portal:Pollution
 * Portal:Famine
 * Portal:Feminism
 * Portal:Women's suffrage
 * Portal:Globalization
 * Portal:Human migration
 * Portal:Human rights
 * Portal:Liberty
 * Portal:Privacy
 * Portal:Slavery
 * Portal:Social equality
 * Portal:Indigenous peoples
 * Portal:Poverty
 * Portal:Suicide

Media (5 portals)

 * Portal:Mass media
 * Portal:Broadcasting
 * Portal:Journalism
 * Portal:News
 * Portal:Publishing

Illness and injury (21 portals)

 * Portal:Diseases (Level 2)
 * Portal:Allergies
 * Portal:Asthma
 * Portal:Cancers
 * Portal:Cardiovascular disease
 * Portal:Strokes
 * Portal:Common cold
 * Portal:Diabetes mellitus
 * Portal:Gastroenteritis
 * Portal:Influenza
 * Portal:Malaria
 * Portal:Meningitis
 * Portal:Mental disorder
 * Portal:Dementia
 * Portal:Major depressive disorder
 * Portal:Pneumonia
 * Portal:Sexually transmitted infections
 * Portal:HIV/AIDS
 * Portal:Smallpox
 * Portal:Tuberculosis
 * Portal:Injuries

Health, fitness, and medicine (11 portals)

 * Portal:Medicine (Level 2)
 * Portal:Dentistry
 * Portal:Hospitals
 * Portal:Surgery
 * Portal:Ageing
 * Portal:Exercise
 * Portal:Health
 * Portal:Nutrition
 * Portal:Malnutrition
 * Portal:Obesity
 * Portal:Sanitation

Drugs and medication (9 portals)

 * Portal:Drugs
 * Portal:Medications
 * Portal:Anesthesia
 * Portal:Antibiotics
 * Portal:Birth control
 * Portal:Vaccines
 * Portal:Addiction
 * Portal:Alcoholism
 * Portal:Smoking

General (5 portals)

 * Portal:Science (Level 1)
 * Portal:Scientific method
 * Portal:Nature (Level 2)
 * Portal:Measurement
 * Portal:Metric system

Astronomy (26 portals)

 * Portal:Astronomy (Level 2)
 * Portal:Universe (Level 2)
 * Portal:Solar System
 * Portal:Sun
 * Portal:Mercury (planet)
 * Portal:Venus
 * Portal:Earth (Level 1)
 * Portal:Moon
 * Portal:Mars
 * Portal:Jupiter
 * Portal:Saturn
 * Portal:Uranus
 * Portal:Neptune
 * Portal:Asteroids
 * Portal:Big Bang
 * Portal:Black holes
 * Portal:Comets
 * Portal:Galaxies
 * Portal:Milky Way
 * Portal:Natural satellites
 * Portal:Orbit
 * Portal:Outer space
 * Portal:Physical cosmology
 * Portal:Planets
 * Portal:Stars
 * Portal:Supernovae

Chemistry (32 portals)

 * Portal:Chemistry (Level 2)
 * Portal:Biochemistry
 * Portal:Inorganic chemistry
 * Portal:Organic chemistry
 * Portal:Physical chemistry
 * Portal:Chemical element (Level 2)
 * Portal:Atoms (Level 2)
 * Portal:Periodic table
 * Portal:Aluminium
 * Portal:Carbon
 * Portal:Copper
 * Portal:Gold
 * Portal:Hydrogen
 * Portal:Iron
 * Portal:Nitrogen
 * Portal:Oxygen
 * Portal:Silicon
 * Portal:Silver
 * Portal:Chemical compounds
 * Portal:Water (Level 2)
 * Portal:Carbon dioxide
 * Portal:Chemical bonds
 * Portal:Molecules
 * Portal:Chemical reactions
 * Portal:Acid–base reaction
 * Portal:Catalysis
 * Portal:Electrolysis
 * Portal:Ions
 * Portal:Metals
 * Portal:Alloys
 * Portal:Bronze
 * Portal:Steel

Biology (68 portals)

 * Portal:Biology (Level 2)
 * Portal:Life (Level 1)
 * Portal:Death (Level 2)
 * Portal:Extinction
 * Portal:Abiogenesis
 * Portal:Cells (biology) (Level 2)
 * Portal:Evolution (Level 2)
 * Portal:Human evolution
 * Portal:Natural selection
 * Portal:Organisms
 * Portal:Animals (Level 2)
 * Portal:Amphibians
 * Portal:Birds
 * Portal:Fish
 * Portal:Insects
 * Portal:Mammals
 * Portal:Humans (Level 1)
 * Portal:Cattle
 * Portal:Dogs
 * Portal:Horses
 * Portal:Reptiles
 * Portal:Dinosaurs
 * Portal:Zoology
 * Portal:Plants (Level 2)
 * Portal:Botany
 * Portal:Flowers
 * Portal:Seeds
 * Portal:Trees
 * Portal:Algae
 * Portal:Archaea
 * Portal:Bacteria
 * Portal:Eukaryotes
 * Portal:Fungi
 * Portal:Viruses
 * Portal:Anatomy
 * Portal:Human body
 * Portal:Circulatory system
 * Portal:Blood
 * Portal:Hearts
 * Portal:Lungs
 * Portal:Digestion
 * Portal:Livers
 * Portal:Immune system
 * Portal:Skin
 * Portal:Muscles
 * Portal:Nervous system
 * Portal:Brains
 * Portal:Ears
 * Portal:Eyes
 * Portal:Skeletons
 * Portal:Ecology
 * Portal:Biodiversity
 * Portal:Ecosystems
 * Portal:Genetics
 * Portal:DNA
 * Portal:Genes
 * Portal:Heredity
 * Portal:RNA
 * Portal:Metabolism
 * Portal:Molecular biology
 * Portal:Proteins
 * Portal:Photosynthesis
 * Portal:Reproduction
 * Portal:Sex
 * Portal:Pregnancy
 * Portal:Sleep (Level 2)
 * Taxonomy
 * Portal:Species

Earth science (23 portals)

 * Portal:Earth science
 * Portal:History of Earth
 * Portal:Climate (Level 2)
 * Portal:Atmosphere of Earth
 * Portal:Global warming
 * Portal:Seasons
 * Portal:Weather
 * Portal:Clouds
 * Portal:Floods
 * Portal:Rain
 * Portal:Snow
 * Portal:Tornadoes
 * Portal:Tropical cyclones
 * Portal:Wind
 * Portal:Geology
 * Portal:Earthquakes
 * Portal:Erosion
 * Portal:Minerals
 * Portal:Plate tectonics
 * Portal:Rock (geology)
 * Portal:Soil
 * Portal:Structure of the Earth
 * Portal:Volcanoes

Physics (40 portals)

 * Portal:Physics (Level 2)
 * Portal:Energy (Level 2)
 * Portal:Time (Level 2)
 * Portal:Days
 * Portal:Years
 * Portal:Classical mechanics
 * Portal:Mass
 * Portal:Momentum
 * Portal:Motion (physics)
 * Portal:Newton's laws of motion
 * Portal:Forces
 * Portal:Electromagnetism
 * Portal:Gravity
 * Portal:Strong interaction
 * Portal:Weak interaction
 * Portal:Magnetism
 * Portal:Matter
 * Portal:State of matter
 * Portal:Particle physics
 * Portal:Standard Model
 * Portal:Subatomic particles
 * Portal:Electrons
 * Portal:Neutrons
 * Portal:Photons
 * Portal:Protons
 * Portal:Quantum mechanics
 * Portal:Quantum electrodynamics
 * Portal:Radioactive decay
 * Portal:Space
 * Portal:Vacuum
 * Portal:Thermodynamics
 * Portal:Heat
 * Portal:Temperature
 * Portal:Theory of relativity
 * Portal:Waves
 * Portal:Electromagnetic radiation
 * Portal:Light
 * Portal:Color
 * Portal:Optics
 * Portal:Speed of light
 * Portal:Sound

General (4 portals)

 * Portal:Technology (Level 1)
 * Portal:Engineering (Level 2)
 * Portal:Civil engineering
 * Portal:Mechanical engineering

Energy (15 portals)

 * Portal:Electricity (Level 2)
 * Portal:Batteries (electricity)
 * Portal:Fire (Level 2)
 * Portal:Explosive materials
 * Portal:Gunpowder
 * Portal:Fossil fuels
 * Portal:Coal
 * Portal:Natural gas
 * Portal:Petroleum
 * Portal:Gasoline
 * Portal:Nuclear power
 * Portal:Renewable energy
 * Portal:Hydropower
 * Portal:Solar energy
 * Portal:Wind power

Tools and machinery (9 portals)

 * Portal:Tools (Level 2)
 * Portal:Simple machines
 * Portal:Wheels
 * Portal:Engines
 * Portal:Electric motors
 * Portal:Internal combustion engines
 * Portal:Jet engines
 * Portal:Steam engines
 * Portal:Robotics

Materials (8 portals)

 * Portal:Glass
 * Portal:Masonry
 * Portal:Metallurgy
 * Portal:Natural rubber
 * Portal:Paper
 * Portal:Plastics
 * Portal:Textiles
 * Portal:Wood

Media and communication (10 portals)

 * Portal:Printing
 * Portal:Books (Level 2)
 * Portal:Mail
 * Portal:Telecommunication
 * Portal:Internet
 * Portal:Radio
 * Portal:Telephones
 * Portal:Mobile phones
 * Portal:Video
 * Portal:Television

Computing and information technology (4 portals)

 * Portal:Computer science
 * Portal:Computers (Level 2)
 * Portal:Artificial intelligence
 * Portal:Cryptography

Electronics (4 portals)

 * Portal:Electronics
 * Portal:Electric light
 * Portal:Integrated circuits
 * Portal:Semiconductor devices

Food and health (10 portals)

 * Portal:Animal husbandry
 * Portal:Domestication
 * Portal:Biotechnology
 * Portal:Genetic engineering
 * Portal:Fertilizer
 * Portal:Gardens
 * Portal:Medical imaging
 * Portal:Pasteurization
 * Portal:Refrigeration
 * Portal:Stoves

Optical (5 portals)

 * Portal:Cameras
 * Portal:Lasers
 * Portal:Lenses (optics)
 * Portal:Microscopes
 * Portal:Telescopes

Transportation (6 portals)

 * Portal:Transport (Level 2)
 * Portal:Aircraft
 * Portal:Bicycles
 * Portal:Cars
 * Portal:Rail transport
 * Portal:Ships

Navigation and timekeeping (7 portals)

 * Portal:Navigation
 * Portal:Compasses
 * Portal:Global Positioning System
 * Portal:Maps
 * Portal:Radar
 * Portal:Calendars
 * Portal:Clocks

Weapons (10 portals)

 * Portal:Weapons
 * Portal:Armour
 * Portal:Artillery
 * Portal:Bows and arrows
 * Portal:Firearms
 * Portal:Knives
 * Portal:Nuclear weapons
 * Portal:Submarines
 * Portal:Swords
 * Portal:Tanks

Structures (8 portals)

 * Portal:Arches
 * Portal:Fortifications
 * Portal:Infrastructure
 * Portal:Bridges
 * Portal:Canals
 * Portal:Dams
 * Portal:Roads
 * Portal:Towers

Space (4 portals)

 * Portal:Rockets
 * Portal:Satellites
 * Portal:Spaceflight
 * Portal:Space stations

Basics (12 portals)

 * Portal:Mathematics (Level 1)
 * Portal:Numbers (Level 2)
 * Portal:Real numbers
 * Portal:Integers
 * Portal:Natural numbers
 * Portal:Prime numbers
 * Portal:Fractions (mathematics)
 * Portal:Complex numbers
 * Portal:Number theory
 * Mathematical constants
 * Portal:0
 * $\pi$

Arithmetic (8 portals)

 * Portal:Arithmetic (Level 2)
 * Portal:Addition
 * Portal:Subtraction
 * Portal:Multiplication
 * Division
 * Portal:Exponentiation
 * Portal:Logarithms
 * nth root

Geometry (16 portals)

 * Portal:Geometry (Level 2)
 * Portal:Angles
 * Portal:Trigonometry
 * Portal:Area
 * Portal:Volume
 * Portal:Coordinate systems
 * Portal:Dimension
 * Portal:Planes (geometry)
 * Portal:Shape
 * Portal:Lines (geometry)
 * Portal:Conic sections
 * Portal:Circles
 * Portal:Polygons
 * Portal:Triangles
 * Portal:Polyhedrons
 * Portal:Spheres

Other (17 portals)

 * Portal:Statistics (Level 2)
 * Portal:Probability
 * Portal:Algebra
 * Portal:Equations
 * Portal:Variables (mathematics)
 * Portal:Mathematical analysis
 * Portal:Calculus
 * Portal:Functions (mathematics)
 * Portal:Infinity
 * Portal:Limits (mathematics)
 * Portal:Algorithms
 * Portal:Combinatorics
 * Portal:Mathematical optimization
 * Portal:Mathematical proof
 * Portal:Series (mathematics)
 * Portal:Sets (mathematics)
 * Portal:Topology