There was a time when people assumed that the world was flat. Once an alternate theory was proposed, the original notion was challenged and, eventually, disproved. In short, theories and ideas can be potent agents of change---none more so than those that are extensively detailed in this book. Fascinating photographs and illustrations accompany the narrative.
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- An Explorer’s Guide
to the Universe - America at War
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- The Britannica Guide to Explorers and Explorations That Changed the Modern World
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