In 1942, physicist John Mauchly proposed building an electronic calculator. The U.S. Army needed help with complex math for warfare.They funded Mauchly's idea. The result was ENIAC (Electronic Numerical Integrator And Computer), built between 1943 and 1945—the first large-scale computer to run at electronic speed without being slowed by any mechanical parts.For a decade, until a 1955 lightning strike, ENIAC may have run more calculations than all mankind had done up to that point. This excerpt f

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