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Ptolemy proposed the geocentric model of the solar system at around 140 AD.
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Nicolaus Copernicus published On the Revolutions of Heavenly Spheres, a book about the heliocentric theory.
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Andreas Vesalius published On the Fabric of the Human Body, a book about human anatomy.
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Galileo's experiment at the Leaning Tower of Pisa was dropping two spheres that had different masses off of the top of the tower.
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Francis Bacon published The Advancement of Learning, a book about scientific knowledge and the pursuit of it.
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Johannes Kepler published his Laws of Planetary Motion after analyzing Tycho Brahe's observations.
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Robert Hooke discovered the first cell, which was named after him.
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Antonie van Leeuwenhoek discovered "protozoa."
