Demokritos (Democritus)

(c. 460 - c. 370 BCE)

Demokritos of Abdura (Ancient Thrace) was a Presocratic Nature Philosopher who posed the Atomic Hypothesis: everything that exits is composed of invisibly small and indivisible (atomon) particles that have always and will always exist.

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Read a more detailed account of Demokritos from the Stanford Encyclopedia of Philosophy