Mostrando entradas de febrero, 2014

Africa: ¿cuna de la humanidad?

Is Africa the cradle of humanity? by Robert Lamb Publicado en 2007 en http://science.howstuffworks.com/life/evolution/africa-cradle-humanity1.htm A Masai warrior surveys the landscape of the Lewa Wildlife Conservancy in Kenya, one of the oldest areas of human occupation.  Joe Sohm/Digital Vision/ Getty Images Out of Africa Theory If you look hard enough, you'll find any number of theories about just where human beings originated -- and who knows? Maybe we really were banished from a Mesopotamian Garden of Eden, or we really did stumble out of a crashed spaceship. The prevailing theory among scientists, however, is that the first Homo sapiensevolved in Africa and, between 56,000 and 200,000 years ago, migrated into other lands. Some anthropologists actually refer to this theory as the out of Africa II theory, as it involves a previous African exodus by tribes of Homo erectus, followed by the scattering of H. sapiens that eventually became human