How Do They Do That?: Wonders of the Modern World Explained

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Morrow, Jan 1, 1981 - Juvenile Nonfiction - 292 pages
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Offers entertaining answers to some of the modern world's greatest puzzles, from how tunnels are dug underwater to how the universe is measured

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Contents

How do they sort mail so that a letter you drop into
17
How do magicians saw a woman in half?
23
How does a highspeed elevator take you 60 floors
41
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