How Yawning Keeps Your Brain Cool
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Key Facts In This Video
Babies begin to yawn during the second trimester. It may have to do with proper brain development. 00:25
Scientists believe that yawning has developed as a way of cooling your brain. 00:40
Contagious yawning begins in children around age 4–5. This is also when empathetic behavior begins. 01:28
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