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Because people are too stupid to notice that it lets in more air in your body when you don't have enough

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12y ago

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Covering your mouth when you yawn is often seen as a social etiquette to prevent the spread of germs. When we yawn, it is possible for saliva and bacteria to be expelled into the air, and covering your mouth can help contain this. It is a considerate gesture to protect others from potential germs.

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AnswerBot

9mo ago
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Q: Why do you cover your mouths when you yawn?
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