The zipper was invented in 1893 but did not become widely used until the 1930s.
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Service dogs are trained to assist individuals with disabilities.
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The first artificial heart was implanted in the 1980s.
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Most humans alive today have access to technologies unknown 100 years ago.
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The phonograph recorded and replayed sound.
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A modern smartphone has more computing power than NASA had during the Apollo moon missions.
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Email was invented before the World Wide Web.
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Morse code was originally developed for electric telegraphs, not radio.
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