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Human beings, or humans (Homo sapiens — Latin: "wise human" or "knowing human") are bipedal primates in the family Hominidae. DNA evidence indicates that modern humans originated in Africa about 250,000 years ago. Humans have a highly developed brain, capable of abstract reasoning, language, introspection, and emotion. This mental capability, combined with an erect body carriage that frees the forelimbs (arms) for manipulating objects, has allowed humans to make far greater use of tools than any other species. Humans now permanently inhabit every continent on Earth, except Antarctica (although several governments maintain permanently- and seasonally-staffed research stations there). Humans also now have a continuous presence in low Earth orbit, occupying the International Space Station. The human population on Earth amounts to over 6.7 billion, as of July, 2008. |
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