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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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