Yawning – we all do it. You might have yawned just now thinking about it. Are you tired? Does your body lack oxygen? While there are multiple theories about why people open their mouth and breathe deeply, we can all agree that the action is contagious. To learn more about these concepts, check out these ten factoids about yawning.
According to several studies, people yawn because it supports a brain-cooling hypothesis. A postdoctoral research associate at Princeton University named Andrew C. Gallup, Ph.D. explained that data collected not only on humans but also rats and parakeets all lead to this conclusion.
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