Humans (Homo sapiens) are the only living species in the Homo genus, in the planet Earth. Anatomically modern humans originated in Africa about 200000 years ago, reaching full behavioral modernity around 50000 years ago.
Humans have a highly developed brain and are capable of abstract reasoning, language, introspection, and problem solving. This mental capability, combined with an erect body carriage that frees the hands for manipulating objects, has allowed humans to make far greater use of tools than any other living species on Earth. Other higher-level thought processes of humans, such as self-awareness, rationality, and sapience, are considered to be defining features of what constitutes a "person".