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Digital computers were initially designed as calculating machines. The first fully electronic computer, the ENIAC, was built by the U.S. military during World War II to produce ballistics tables for artillery in battle. Computers then were clumsy, hulking devices the ENIAC had 18,000 vacuum tubes, and measured 50 x 30 feet that did calculations for scientific research. Only a handful of scientists considered the possibility of personal computing for creative purposes by non-specialists.