Thales’ pupil Anaximander challenges Thales' position that …

Years: 621BCE - 478BCE

Thales’ pupil Anaximander challenges Thales' position that a single element can be the origin of all.

He argues that, because known elements are constantly opposing and changing into one another, something different from these elements must therefore underlie, and cause, changes, postulating the apeiron "boundless or "indefinite" as the original and sustaining substance.

Believing Earth to be cylindrically shaped, Anaximander produces the first map of the known world and speculates about the origins of marine life.

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