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Humans

Why did humans evolve big brains? A new idea bodes ill for our future

Recent fossil finds suggest that big brains weren't an evolutionary asset to our ancestors but evolved by accident – and are likely to shrink again in the near future

By Colin Barras

8 July 2024

×îÐÂÂé¶¹ÊÓÆµ. Science news and long reads from expert journalists, covering developments in science, technology, health and the environment on the website and the magazine.

adobe stock/Phoebe Watts

Nobody  doubts that Albert Einstein had a brilliant mind. But the Nobel prizewinner, famous for his theories of special and general relativity, wasn’t blessed with a big brain. “It was smaller than average,” says at Dartmouth College in New Hampshire.

This seems surprising. Big brains are a defining feature of human anatomy, and one we are proud of. Other species might be speedy or powerful, but we thrive using the ingenuity that comes with a large brain. Or so we tell ourselves. Einstein’s brain hints that the story isn’t so simple – and recent fossil discoveries confirm this.…

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