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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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![Kehl, Germany. 15th June, 2020. In front of a shoe shop there is a sign saying in French "Chers Francais Nous sommes tres heureux de vous revoir a Kehl! Nous vous souhaitons Kehl, Germany. 15th June, 2020. In front of a shoe shop there is a sign saying in French "Chers Francais Nous sommes tres heureux de vous revoir a Kehl! Nous vous souhaitons](https://l450v.alamy.com/450v/2c1a40b/kehl-germany-15th-june-2020-in-front-of-a-shoe-shop-there-is-a-sign-saying-in-french-chers-francais-nous-sommes-tres-heureux-de-vous-revoir-a-kehl!-nous-vous-souhaitons-la-bienvenue-dans-notre-boutique-de-chaussures!-in-english-this-means-dear-frenchmen-we-are-very-happy-to-see-you-again-in-kehl!-we-welcome-you-in-our-shoe-shop!-since-midnight-the-border-crossing-between-germany-and-france-can-be-crossed-again-in-both-directions-without-restrictions-credit-uli-deckdpaalamy-live-news-2c1a40b.jpg)