Yawn

Why do we yawn, and why is yawning contagious? Nobody really knows why we yawn, even though medical literature is full of possible explanations. One that has gained popularity in recent years, is that yawning may help regulate brain temperature. The brain operates best within a narrow range of temperatures. To lower the brain’s temperature, researchers suspect, the body takes in cooler air from its surroundings by yawning. This argument seems to have been strengthened after researchers placed ice packs of the heads of test subject,…

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