We have a childhood twice as long as that of our closest primary relatives jim pensees by the time they're seven are producing as much food as they're consuming and even in foragicultures we aren't humans aren't doing that until at least age 15 if not later so that's really puzzling why do we have this very long period of childhood. In evolutionary biology people have talked about the idea that it is that long protected period that actually enables you to learn as much as you do so. It turns out that in fact this isn't just true about humans there's a very general relationship between how long a period of childhood an animal has and how many neurons it hasHow big

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