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The journey of life.

Thursday May 19, BBC1, 9-10pm Five million years ago early humans separated from their chimpanzee cousins and took a different evolutionary path. Steve Leonard (pictured) explains how climate change drew humans down from the trees and out on to the newly formed African savannah. Today, by watching chimps attempt to tie their keepers' shoelaces, he shows us how early humans used their hands and brains to make an impact on their new habitat and begin to control it.