What did the cotton gin, invented by Eli Whitney in 1793, do?
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Who invented the phonograph, the first device that could record and replay sound?
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Who invented the telescope in the early 1600s?
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Who invented the first practical battery in 1800?
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Igor Sikorsky designed and flew the first practical version of which aircraft in 1939?
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Who invented the microwave oven after radar waves melted a chocolate bar in his pocket?
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Who built the first full-scale working steam locomotive in 1804?
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What household machine did Elias Howe patent in 1846?
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Who invented the barometer, the instrument used to measure air pressure?
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Samuel Morse is famous for co-creating which communication system?
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