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Democritus was born in 460 BC. He formulated the first atomic theory. This gave later scientists a theory to build on.
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Hypocrites was born in 460 BC. He was known as "The Father of Medicine".
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Aristotle was born in 384 BC. He believed in the four elements of air, earth, water, and fire. He also believed that all parts of matter could be cut in half an infinite amount of times. This gave us the idea that any piece of matter was made up of something smaller than itself.