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Early computers from the 1940s were so enormous, they had to be put into their own rooms.

Rather than using computer chips and their microscopic transistors like we have today, the earliest computers used what are known as vacuum tubes to store information. Thousands of these tubes, resembling small light bulbs, were required to build computers—and extremely weak ones by today's standards. The ENIAC, a computer built in 1945 for use by the U.S. military, had a mass of 27,200 kg and measured 2.4 m × 0.9 m × 30 m, occupying 167 m2 of space.

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