GPS exists because of Einstein’s theory of relativity correcting time differences.
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The Itaipu Dam is one of the largest hydroelectric projects in operation.
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Nuclear reactors generate electricity by using the heat from controlled fission chain reactions to boil water and spin turbines.
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The lithium-ion battery, now powering billions of devices, was developed in the 1970s–80s by researchers including John Goodenough.
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The light bulb made electric lighting widely practical.
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The U.S. military tested radar systems in classified research programs.
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The first video game ever sold commercially was Computer Space in 1971, before Pong.
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The refrigerator allowed long-term food storage.
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The High Dam of Aswan created Lake Nasser.
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