A version of this story appears in the September 2020 issue of National Geographic magazine. Philadelphia detected its first case of a deadly, fast-spreading strain of influenza on September 17, 1918.
Roughly one-in-five U.S. teens say they are on TikTok and YouTube almost constantly. At the same time, 64% of teens say they use chatbots, including about three-in-ten who do so daily. Fresh data ...
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