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Continue to ChatOur cautious ancestors, when yawning, blocked the way to the entrance of evil spirits by putting their hands before their mouths. We find a reason for the gesture in the delicacy of manner which forbids an indecent exposure. - George H. Mead from https://whatsmyquote.com/quote/our-cautious-ancestors-when-yawning-blocked-the-way-to-the-entrance-of-evil-spirits-by-putting-their-hands