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Alcmaeon of Croton distinguished veins from arteries
(because he was an early Greek medical writer)

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Diocles wrote the first known anatomy book
(first systematic work on the subject)

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Roger Bacon invents spectacles
(to help people see)

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Leonardo da Vinci dissects corpses
(to study animals)

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Zacharius Jannssen invents the microscope
(to get a closer look on things)

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Anton van Leeuwenhoek discovers blood cells
(to see what blood does)

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Anton van Leeuwenhoek observes bacteria
(fungus)
(cell walls

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Claudius Aymand performs the first successful appendectomy
(removal of appendix)

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Rene Laennec invents the stethoscope
(to listen to your heat, congestion and also see if you have irregular heart beats)

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James Blundell performs the first successful transfusion of human blood
(moving of blood)

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First vaccine developed for cholera
(help with bacteria)

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First contact lenses developed
(help to see without spectacles)

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Felix Hoffman develops aspirin
(help with pain and to take it away)

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Earle Dickson Invented the Band-Aid
(to cover up scars)

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First vaccine developed for whooping cough

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Sir Alexander Fleming discovers penicillin

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First vaccine developed for yellow fever

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John Hopps invented the first cardiac pacemaker

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First vaccine developed for chicken pox

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First vaccine developed for chicken pox