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  1. Math

    Fibonacci’s Missing Flowers

    The number of petals that a flower has isn't always a Fibonacci number. For more math, visit the MathTrek blog.

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  2. Humans

    The Influenza Epidemic of 1918

    This eye-opening Web site from the National Archives and Records Administration features photos and documents related to the influenza epidemic of 1918, which killed more people than died in World War I. Go to: http://www.archives.gov/exhibits/influenza-epidemic/

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  3. Humans

    From the May 30, 1936, issue

    A shaking mountain, a warm blood factory, and signaling with invisible heat rays.

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  4. Physics

    String Trio: Novel instrument strums like guitar, rings like bell

    A new type of musical instrument, equipped with Y-shaped strings, may be the first of a family of string instruments with unusual overtones typically heard in bells or gongs.