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Didier Descouens · Public domain (via Wikimedia Commons)
Leucippus (Greek: Λεύκιππος) (500 BC to 440 BC), an ancient Greek philosopher, was the first to propose atomic theory (everything is composed of atoms) and was the teacher of Democritus.
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Wikidata profile: Q165589 Wikipedia article: Leucippus Leucippus Wikidata · wikidata Leucippus Wikipedia · wikipedia