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Why Do We Yawn?

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What makes yawning so contagious? To get more oxygen? To cool the brain down?!?! Why are yawns contagious? Why do some groups yawn less?

The Yawn-O-Meter video — https://www.youtube.com/watch?v=AJXX4vF6Zh0 — makes a great introduction

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Resource Link:  https://www.youtube.com/watch?v=I0dQx4SNSwE

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    • Brains & Neurons

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