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Do you know this famous four? The first Ionians to question the world around them...
"The first scientists of western Asia proposed that the primary constituents of the universe when it arose were material substances. The first of them whose name we know was Thales. Thales was born in the 620s. He thought that the first cosmic principle or element-the one being pushed back by new land-was water. The argument he seems to have used to support this view was that inanimate things lose water and dry out. His student Anaximander then drew a map of all the physical world the Milesians knew; he suggested that the world they could perceive-both land and sea, which visibly limited each other-must be surrounded by something else that was limitless and immeasurable-apeiron. The third Milesian thinker of the time, Anaximenes, watched land expand and sea shrink, and argued that all the constituents of the world man could see-fire, wind, cloud, water, earth, stones-are created out of air by processes of condensation or sublimation: the differences between them are to be explained in terms of their relative density. In Ephesus, another city not far from Miletus which also became steadily cut off from the sea, a fourth thinker named Heraclitus asserted the principle that the physical universe was constantly changing because of the action, rather, of a cosmic fire: 'panta rhei', he said, ‘everything is in flux’."
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