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Their actual efficacy is questionable at best though. After about 10 minutes of breathing, water vapor from your own breathing would have rendered it more or less permeable to anything infectious. Sneezing into a handkerchief would probably be more effective.

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If it catches your spit when you pronounce sounds like "p" and "t", and catches your sneeze particles, it's likely to be pretty helpful.

Efficiency is another question, it may be more of a "it's the thought that counts".

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