People assumed brain size correlated with how smart you could be or how sophisticated you would be but it's not so clear that it's that simple. Even our ancestors 50,000 years ago well why do they need a larger brain volume? They may have been much more physical than anyone on planet today. It does connect through to the tension between sort of our success in the world as a species or just the probability of us continuing to propagate both as individuals and our particular gene lineages.

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