Why Do We Yawn?
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02:31

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. (0:25)

  • 2

    Scientists believe that yawning has developed as a way of cooling your brain. (0:40)

  • 3

    Contagious yawning begins in children around age 4–5. This is also when empathetic behavior begins. (1:28)

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Biology

Brain

Mammals

Pollution

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