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This work offers a glimpse at the behind-the-scenes battles during World War II between the scientists, mathematicians, physicists, and technicians on both Allied and Axis sides as they raced to harness new technologies and change the course of the war. It features more than 70 tales of ingenious secret weapons and innovations - from radar, huff-duff (high frequency direction finding), invisible radio beams, to secret codes, electronic guidance systems, homing devices and submarine detection instruments.