How Humans Ended Up With Freakishly Huge Brains

Scientists have begun to identify the symphony of biological triggers that powered the extraordinary expansion of the human brain. There it was, sitting on the mantelpiece, staring at her with hollow eyes and a naked grin. She could not stop staring back. It looked distinctly like the fossilized skull of an extinct baboon. That was the sort of thing Josephine Salmons was likely to know. At the time—1924—she was one of the only female students of anatomy attending the University of...

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