Yawning keeps brain cool
Yet another research, but one that has really impressed me. I have always wondered what is yawning good for, and especially how can it be so contagious. This hypothesis here sounds really good:
Yawning is a way for the body to cool the brain, when other systems in the body are not doing enough. The researchers found that people yawned more often in situations in which their brains were likely to be warmer, and less when they had cool heads.
"A cooler brain, Gallup said, is a clearer brain.
So yawning actually appears to be a way to stay more alert. And contagious yawning, he said, may have evolved to help groups remain vigilant against danger."
So, who will write up the Yawning Sentinels, the elite king's guard?