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.

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Explore the Security Market Line in CAPM to assess stock value and risk, aiding investment decisions and enhancing portfolio management.

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A well-designed trust can help save time, paperwork and other headaches when settling an estate. Many, or all, of the products featured on this page are from our advertising partners who compensate us ...