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Why Do We Yawn?

Key Facts In This Video

  1. Babies begin to yawn during the second trimester. It may have to do with proper brain development. 00:25

  2. Scientists believe that yawning has developed as a way of cooling your brain. 00:40

  3. Contagious yawning begins in children around age 4–5. This is also when empathetic behavior begins. 01:28

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