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Copernicus discovered the mathematically yet unproven heliocentric solar system.In his treatise, 'On the Revolutions of the Celestial Spheres' he postulated that the planets, including the earth, revolve around the sun, and that the earth revolved around its axis once every day.Epicurus - Greek philosopher; founded the system known as Epicureanism.He studied with followers of Plato and Democritus before opening his school in Athens.Empedocles - Some suggest (c.484-c.424) - Greek doctor, poet and philosopher.

Empedocles presented a kind of biological theory of natural selection in an imaginative poem, On Nature.The work had a hostile reception when it was published (1543), as it challenged the ancient teaching of the Earth as the centre of the universe.In the 1600' Galileo and Kepler began to develop the physics that would prove Copernicus right.William Gilbert - Some say (1544-1603) - English physician; known for his early studies on electricity and magnetism.His De magnete (1600) propounded the theory that the earth was a giant lodestone with north and south magnetic poles.

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