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Human history is the record of humankind from prehistory to the present. Modern humans evolved in Africa around 300,000 years ago and initially lived as hunter-gatherers.They migrated out of Africa during the Last Ice Age and had spread across Earth's continental land except Antarctica by the end of the Ice Age 12,000 years ago.
History of Animal Evolution Archived 2016-06-27 at the Wayback Machine; Tree of Life Web Project – explore complete phylogenetic tree interactively; Human Timeline (Interactive) – Smithsonian, National Museum of Natural History (August 2016).
"The History of Animal Evolution". Plant and Animal Evolution. University of Waikato. Archived from the original on 2016-06-27 Sequence of Animal Evolution; Yeo, Dannel; Drage, Thomas (2006). "History of Life on Earth". Archived from the original on 2015-03-15; Exploring Time. The Science Channel. 2007
In their seminal 1967 paper in Science, Sarich and Wilson estimated the divergence time of humans and apes as four to five million years ago, [236] at a time when standard interpretations of the fossil record gave this divergence as at least 10 to as much as 30 million years.
The estimated time for all nucleons in the observable universe to decay, if the hypothesized proton half-life takes its smallest possible value (8.2 × 10 33 years). [144] [note 4] 10 36 –10 38 (1–100 undecillion) Estimated time for all remaining planets and stellar-mass objects, including the Sun, to disintegrate if proton decay can occur. [9]
Nuclear war is an often-predicted cause of the extinction of humankind. [1]Human extinction or omnicide is the hypothetical end of the human species, either by population decline due to extraneous natural causes, such as an asteroid impact or large-scale volcanism, or via anthropogenic destruction (self-extinction), for example by sub-replacement fertility.
There is some evidence that modern humans left Africa at least 125,000 years ago using two different routes: through the Nile Valley, the Sinai Peninsula and the Levant (Qafzeh Cave: 120,000–100,000 years ago); and a second route through the present-day Bab-el-Mandeb Strait on the Red Sea (at that time, with a much lower sea level and ...
Post-classical history – Period of time that immediately followed ancient history. Depending on the continent, the era generally falls between the years AD 200–600 and AD 1200–1500. Depending on the continent, the era generally falls between the years AD 200–600 and AD 1200–1500.