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  On the Revolutions of the Heavenly Spheres, is a book about the heliocentric theory.
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  "On the fabric of the human body in seven books") is a set of books on human anatomy written by Andreas Vesalius and published in 1543.
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  Galileo Galilei dropped two spheres of different masses from the Leaning Tower of Pisa to demonstrate that their falling time was independent of their mass.
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  Francis Bacon's The Advancement of Learning is the first major philosophical book written in English.
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  Kepler's published "Laws of Planetary Motion" which is three laws of motion.
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  The cell was first discovered and named by Robert Hooke in 1665.
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  Van Leeuwenhoek is often cited as the first microbiologist to study muscle fibers, bacteria, spermatozoa and blood flow in capillaries.
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