Web edition: November 18, 2011
Print edition: December 3, 2011; Vol.180 #12 (p. 29)
Learn how Léon Foucault, a sickly child and poor student, grew up to design a simple experiment that demonstrated for the first time that the Earth rotates.
Random House, 2010, 32 p., $17.99, ages 7–9
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