Thales of Miletus Ancient Greek Philosopher

Thales was a philosopher, politician, businessman, and teacher. He proposed the question “What is the basic material of the cosmos?” and introduced the theory of monism into Western philosophy.

He reasoned that everything in the universe was created from a single substance. An ever changing substance essential to life. Something out of which everything else could be formed.

His observations revealed that water is integral to life and is constantly changing between physical states.

Hence, Thales concluded that matter must be water in the process of changing from one state to another.

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