Science

The Real Reason Thinking So Hard Makes You Tired

THOUGHTLESS

It may be the brain’s way of protecting itself against toxic chemicals.

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Photo Illustration by The Daily Beast / Getty

Ever get home from the office and feel exhausted, even though you’ve sat at a desk all day? Scientists think they have figured out the reason why thinking hard can make you tired, giving new meaning to a “mental vacation.”

A group of researchers at the Paris Brain Institute have shown...

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