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  Discovered difference between smallpox and measles.
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  The book of Healing and The Cannon of Medicine was written
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  Leonardo da Vinci dissects corpses
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  invents the microscope
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  Anton van Leeuwenhoek observes bacteria.
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  He develops the process of vaccination for smallpox, the first vaccine for any disease.
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  performs the first successful transfusion of human blood
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  Creates system to classify different blood types.
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  study showed that adult cells including stem cells can be turned back into stem cells
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  discovered how to make healthy liver out of stem cells
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