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Oct 11, 1543
Andreas Vesalius
Covering the field of Anatomy, we have Andreas Vesalius. Following the advice of Leonardo da Vinci, "I advise you not to trouble with words unless you are speaking to blind men". Vesalius, ignoring Galen's previous work, did a study of the human body and wrote a seven volume book called On the Fabric of the Human Body. -
William Harvey
William Harvey continued Andreas Vesalius' work, and studied blood circulation. He discovered how veins and arteries carry blood and he discovered how the heart works.