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“What’s your degree in? Dentistry?”

http://dx.doi.org/10.1371/journal.pone.0099994

http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0099994

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How is this significant?

I've read that the bacteria that is found in your bathroom commode can also be found on your pillow case in your bed.