A History of Big-Headedness

www.economist.com

The Economist:

The ultimate cause of human brain expansion thus remains unknown. Tool-making is one explanation. A more intriguing theory is that human brains are the equivalent of brightly coloured plumage in birds, permitting the sexes to show off to each other what good mates they would make. Yet another idea, the Machiavellian-intelligence hypothesis, is that big brains enable people to manipulate others to their own advantage — a trick that the invention of language would also assist.

Hard to say which theory I find more fascinating…

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