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You did not know until now that it is impossible to hum and swallow at the same time, amirite?

46%Yeah You Are54%No Way
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That's because when you swallow the epiglottis covers the trachea so that nothing goes down your wind pipe and instead is redirected down your esophagus. When you breath, the epiglottis moves away, allowing the flow of air. And you need air so that your vocal cords have something to vibrate around and create sound. It's just basic anatomy.

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