The Britannica Guide to Theories and Ideas That Changed the Modern World By: Britannica Educational Publishing Publisher: Britannica Educational Publishing Print ISBN: 9781615300297, 1615300295 eText ISBN: 9781615300631, 1615300635 Edition: 1st Pages: 304 Copyright year: 2009 Format: PDF Available from $ 17.63 USD SKU 9781615300631R180 There was a time when people assumed that the world was flat. Once an alternate theory was proposed, however, that conceit 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. Download eBook Free: https://ouo.io/7bFQ3M