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Wearing shoes in the house is just plain gross. The verdict from scientists who study indoor contaminants
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World map of tradition of removing shoes in home. Green: shoes removed; Blue: shoes not removed. (Wikimedia, res: 2000 px) : r/MapPorn
4 reasons wearing shoes inside is bad for your health, from 'forever chemicals' to hidden poop germs
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No shoes in the house' — the cultural difference of wearing shoes in the house in the Netherlands – DutchReview
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