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Primates and the Fertility Problem
Humans evolved away from chimpanzees and the gorillas about 7 million years ago. They were operating in a kind of cheap chimpanzee type of environment or rather impoverished chimpanzee environment. But once you get the genus homo appearing, sort of humans, if you like, proper 2 million years ago, so our lineage really taking off. And at that point, you see evidence in terms of brain size for dramatically increasing group sizes. It's the way that plants respond to their local ecology. This is true.