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Reviewed on Jan 14st, 2020

Cool Quiz! Trivia, Quizzes, Puzzles, Jokes, Useless Knowledge, FUN!

Search Cool Quiz! Advanced Search ». Fact of the Day On December 15, 1854, Philadelphia began using the first street-cleaning machine. That Explains It! How do silkworms make silk? People | Insects and Animals | Inventions & Machines | Environment, Space & Science | Food, Drinks & Snacks | Customs & Superstitions | Places

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