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ã®å¥åº·ãé¡ãã®ã§ããã°ãèªéãã twitter.com/DKThomp/status⦠Derek Thompson @DKThomp Now that's three CDC studiesâfrom a Chinese restaurant, a Korean call center, and an American choir practiceâall finding that talking, laughing, singing in close quarters, in unventi
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