How the Presocratic Philosophers Invented Critical Rationalism

How the Presocratic Philosophers Invented Critical Rationalism

Thales of Miletus, a Presocratic philosopher born in 626 BCE, proposed that the underlying, fundamental substance of all matter was water, while his student Anaximander thought the substance was an indefinite material called Apeiron. Anaximenes, Anaximander’s student, disagreed with both and thought the fundamental substance was air, while Heraclitus disagreed with everyone and thought the substance was fire. 

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