Yawns Promote alertness, brain cooling
This is a news story, published by CBS News, that relates primarily to Johns Hopkins University news.
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•Yawning isn't just for humans. Here's why fish, birds and other animals yawn too, according to an expert.
77% Informative
The "evolutionarily ancient" act of yawning likely serves a few purposes, a Johns Hopkins University professor says.
Yawns have been shown to increase arousal and alertness as associated with these state changes.
Research also suggests yawning has a brain-cooling function.
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