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Roger Bacon invents spectacles
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Leonardo da Vinci dissects corpses
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Zacharius Jannssen invents the microscope
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Anton van Leeuwenhoek discovers blood cells
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Dr. Horace Wells uses nitrous oxide as an anesthetic
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First contact lenses developed
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Rene Laennec invents the stethoscope
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John Hopps invented the first cardiac pacemaker
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First vaccine developed for measles.
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First vaccine to target a cause of cancer