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The Fruits of War
The book would also be useful as a source of quotes of how people have underestimated the possibilities of new technologies - for instance in 1901 Wibur Wright predicted that man would not fly for 50 years, and in 1920 the New York Times stated that rockets would not work beyond the atmosphere (they published a correction in 1969). It also interesting to find out about how new weapons could change the balance of power between established rulers and small groups which challenge them. However, I didn't think that these individual points of note were sufficient to maintain the interest of the reader throughout this longish book.