They are correct though. There is no evidence that chimps walked out of Africa. For two reasons:
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They can't walk for that length of time because we're the ones who walk everywhere, they hang out in trees.
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No one ever said they did.
I'm wondering if this person has ever even seen a chimp, to be honest.
Well if we go by Dragon Ball Z rules, the change will happen in another timeline, and he'll come back to this unchanged one.