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"Big-brained, hairless, weak, precision grip, small teeth and stomach" would look great on a dating profile.

Heinrich's theory seems plausible, otherwise you wouldn't be writing about it, or would have written more about what you think the theory gets wrong. But roughly how plausible would you rate it, if, hypothetically, you were asked to by a person who enjoyed this post but probably won't read the book to decide for himself?

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