Second Opinion
What longer yawns say (maybe) about brain size
The average yawn duration — which ranged from 0.8 seconds in mice to 6.5 seconds in humans — was a “robust” predictor of a species brain weight and size.
yawning
Second Opinion
More evidence that yawning helps our brains ‘keep their cool’
A new study supports the brain-cooling hypothesis by finding that yawning may not be necessary when ambient temperatures are too cold (not necessary) or too hot (not effective).
