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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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British obstetrician James Blundell performs the first successful transfusion of human blood.
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Dr. Horace Wells uses nitrous oxide as an anesthetic
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Dr. Horace Wells, American dentist, uses nitrous oxide as an anesthetic
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First contact lenses developed
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Emil von Behring discovers antitoxins and uses them to develop tetanus and diphtheria vaccines
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German physicist Wilhelm Conrad Roentgen discovers X rays.
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Felix Hoffman develops aspirin (acetyl salicylic acid). The juice from willow tree bark had been used as early as 400 BC to relieve pain.
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Rene Laennec invents the stethoscope
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Insulin first used to treat diabetes.
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First vaccine for Tuberculosis created
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First vaccine for influenza was developed.
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John Hopps invented the first cardiac pacemaker
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First vaccine developed for measles
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HIV, the virus that causes AIDS, is identified
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First vaccine to target a cause of cancer
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Scientists discover how to use human skin cells to create embryonic stem cells.