Yawning helps the brain cool down. Photo: Reuters Yawning helps the brain cool down. Photo: Reuters
Yawning helps the brain cool down. Photo: Reuters

The mystery of yawning: scientists suggest it’s proof of a bigger brain

Brain weight is a reliable predictor of yawn length, more reliable than total body size or relative brain size

Yawning helps the brain cool down. Photo: Reuters Yawning helps the brain cool down. Photo: Reuters
Yawning helps the brain cool down. Photo: Reuters
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