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A high-school science teacher had him time the swing of a pendulum at various lengths. He found that graphing his measurements formed a parabola. \u201cI got an uncanny chill. There\u2019s something secret that I have just seen, that if you don\u2019t know math, you can\u2019t see.\u201d A mathematician is born. Plus, life with Murray the dog. Music: Bobby Sanabria. Presented with the National Museum of Mathematics.