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apr 20, 400 BC - Democritus - 400 B.C.

Description:

Came up with atomic theory which stated that the universe is composed of two elements: the atoms and the void in which they exist and move. According to Democritus atoms were miniscule quantities of matter.

Added to timeline:

10 Oct 2017
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Date:

apr 20, 400 BC
Now
~ 2427 years ago