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Why Do We Yawn?

Source: Wikimedia A yawn is a deep breath that is taken within a normal breathing cycle, usually with the mouth wide open, presumably to maximise the body’s capacity to feed the lungs with greater levels of oxygen. If you have been spending hours gambling online or playing video games, then yawning is probably a sign that you ought to take a break and do something else for a bit. That said, yawning does not only occur after we have been relatively sedentary for a period of time. We can [Read more ...]