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Editors, Scientific AmericanSCIENTIFIC AMERICAN'S ASK THE EXPERTS MJF Books 2006 1567318096 / 9781567318098 First Hardcover Near Fine/Near Fine What makes a knuckleball flutter? Is time travel theoretically possible? Wh at exactly is quicksand, anyway? Find out the answers to these and many oth er puzzling questions. Price: