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The bigger your brain, the longer you yawn.

Here's a new result from the field of Chasmology that may or may not make you yawn: according to this study, yawning duration is correlated with brain size in mammals. How did these researchers uncover this correlation? Why, by watching YouTube videos of animals yawning, of course! The authors suggest that animals with bigger or more complex brains require longer yawns to get the full effects of the yawn, which (while still somewhat mysterious) may be related to brain cooling.
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