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Pre-Socratic Philosopher Year The idea that was not supernatural, but natural
Thales ~550s BCWater
Anaximander ~550s BC Indefinite/Aperion-
Anaximenes ~530s BC Air
Pythagoras ~480s BC Numbers
Heraclitus ~510s BC Change
Empedocles ~420s BC Four elements
Anaxagoras ~430s BC Nous/Mind
Democritus ~380s BC Atoms