MRI machines use powerful magnetic fields and radio waves — no ionizing radiation — to image soft tissue.
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The world's first programmable computer, the Colossus, was built secretly in Britain during World War II to decode Nazi messages.
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The printing press was invented around 1440 by Gutenberg — within 50 years, over 20 million books had been printed.
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The transistor, invented in 1947, made modern computers possible by replacing bulky vacuum tubes.
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