Richard Leakey's amazing discovery in Kenya completely changed what was previously known about human origins - there wasn't a single line leading to humans, but many branches and many different species. So, where did we come from? Five million years ago changes in habitat created differences among primates that eventually led to homo Ergaster two million years ago, and then Homo Ergaster evolved even greater changes to become Homo Sapiens. Aired on Discovery Channel in 1999
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