Evolution ! ~ 4+ billion years of earth ! 3.5 billion years of life ! 650 million years of multi-celled organisms ! 600 million years of nervous system ! ~ 200 million years of mammals ! ~ 60 million years of primates ! ~ 6 million years ago: last common ancestor with chimpanzees, our closest relative among the “great apes” (gorillas, orangutans, chimpanzees, bonobos, humans) ! 2.5 million years of tool-making (starting with brains 1/3 our size) ! ~ 150,000 years of homo sapiens ! ~ 50,000 years of modern humans ! ~ 5000 years of blue, green, hazel eyes
Posted on: Sun, 27 Oct 2013 22:38:05 +0000