Humans, or human beings, are bipedal primates belonging to the mammalian species Homo sapiens. Compared to animals, humans have a highly developed brain capable of abstract reasoning, language, and introspection. This mental capability, combined with an erect body carriage that frees their upper limbs for manipulating objects, has allowed humans to make far greater use of tools than any other species. DNA evidence indicates that modern humans originated in Africa about 200,000 years ago.[13] Humans now inhabit every continent and low Earth orbit, with a total population of over 6.73 billion humans as of January 2009.[14] Like most primates, humans are social by nature. However, humans are particularly adept at utilizing systems of communication for self-expression, the exchange of ideas, and organization. Humans create complex social structures composed of many cooperating and competing groups, from families to nations. Social interactions between humans have established an extremely wide variety of traditions, rituals, ethics, values, social norms, and laws which form the basis of human society. Humans have a marked appreciation for beauty and aesthetics which, combined with the human desire for self-expression, has led to cultural innovations such as art, literature and music. Humans are noted for their desire to understand and influence the world around them, seeking to explain and manipulate natural phenomena through science, philosophy, mythology and religion. This natural curiosity has led to the development of advanced tools and skills. Development Main article: International development A summary of world development: The universe is continuing its metric expansion. Our galaxy is approaching its neighbor The Sun is shining brighter and brighter. The Earth's surface is getting hotter. Species are becoming fewer. Humans are increasing in number. Human life expectancy, literacy, education, standard of living, and GDP per capita are increasing. Technology and socioculture are also developing. See also Antarctica Oceania Africa Asia Europe North America South America Pacific Ocean Pacific Ocean Atlantic Ocean Indian Ocean Southern Ocean Arctic Ocean Middle East Caribbean Central Asia East Asia North Asia South Asia Southeast Asia SW. Asia Australasia Melanesia Micronesia Polynesia Central America Latin America Northern America Americas C. Africa E. Africa N. Africa Southern Africa W. Africa C. Europe E. Europe N. Europe S. Europe W. Europe

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