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.
Best VPN for 2025: Our Top 10 Favorite VPN Services The Best VPNs for Florida in 2025 Florida offers sunshine and countless attractions, but it’s crucial to remember that—just like anywhere else—its ...
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