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Greek philosopher Ptolemy creates a geocentric (earth-centered) theory that the Earth is the center of the universe.
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Nicolaus Copernicus publishes his book about how the planets revolved around the sun.
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Andreas Vesalius publishes his book about the human body.
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Galileo tested his theory that two objects with different masses will fall at the same speed at the Leaning Tower of Pisa in Italy.
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The Advancement of Learning is about learning about science and the current state of knowledge.
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Johannes Kepler publishes his theory that all planets move in ellipses.
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Robert Hooke discovered cells and named them after the rooms monks lived in.
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In 1676, Antonie van Leeuwenhoek looks at water closely and finds tiny organisms in the water.
