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They were put in guns and they were like bullets.
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They let you flush your poop down.
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You could print stuff and copy things.
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They kept time. Galileo was the inventor.
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They were underwater warships.
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They helped people see. Gutenberg was the inventor.
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They were put on telescopes and microscopes. They made stuff look closer.
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They were put on walls to make them pretty.
