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Andreas Vesalius wrote a book on the human anotmy
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the book was Nicolaus Copernics way of explaining his theory about his helocentric model
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this way his experiment were he droped 2 balls of diffrent sizes and seen they drop at the same pace
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this was his book that he wrote talking about orbits, eclipses ect.
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this was a way that the eath was in the middle of the universe