User:Paulleocunanan/sandbox

The control of fire enabled important changes in human behavior, health, energy expenditure, and geographic expansion.[15] As a result of “domesticating” fire as previously achieved with plants and animals, humans were able to modify their environments to their own benefit. This ability to manipulate their environments allowed them to move into much colder regions that would have previously been uninhabitable after the loss of body hair[16]. Evidence of more complex management to change biomes can be found as far back as 100,000 to 200,000 years ago at a minimum Furthermore, activity was no longer restricted to daylight hours due to the use of fire. Exposure to artificial light during later hours of the day changed humans’ circadian rhythms, contributing to a longer waking day. The modern human’s waking day is 16 hours, while most mammals are only awake for half as many hours. Additionally, humans are most awake during the early evening hours, while other primates’ days begin at dawn and end at sundown. Many of these behavioral changes can be attributed to the control of fire and its impact on daylight extension.