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WHY DO WE YAWN

Scientist cannot explain why everybody on the planet yawns-in most cases,several times a day. Even babies in the womb do it. So do, hedgehogs, ostriches, snakes, and fish. There are lot of theories, often contradictory, but none satisfy all the researchers. Many scientists have proposed that an explanation for this gulp of air, lasting six seconds on average, is to augment the brain’s oxygen supply. Yet “so far, researchers haven’t found evidence supporting this suspicion,” says Science News. New studies on rats seem to seem to suggest that “a yawn may be a thermostat, cooling an overheated brain.” But no one really knows.