Yawning is good for health because it cools the brain. A study shows that people yawned more often in situations in which their brain were likely to be warmer. During the study, one group of volunteers were instructed o breathe only through their noses, which is thought to cool the brain; a second group applied cold packs to their foreheads, also a cooler, and the third group applied hot packs to their foreheads. The two conditions thought to promote brain cooling practically eliminated contagious yawning.
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