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Laurence Bergreen

LAURENCE BERGREEN is the bestselling author of Over the Edge of the World: Magellan's Terrifying Circumnavigation of the Globe . His other books include Columbus: The Four Voyages, 1492-1504; Marco Polo: From Venice to Xanadu ; and Voyage to Mars: NASA's Search for Life Beyond Earth . A graduate of Harvard, Bergreen lives in Manhattan.