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Anaximenes d.c.500BC
Greek philosopher

Born in Miletus, Asia Minor, he became the third of the three great Milesian thinkers, succeeding Thales and Anaximander. No biographical details are known about him. He proposed that the first principle and basic form of matter was air, which could be transformed into other substances by a process of condensation and expansion. He also believed that the Earth and the heavenly bodies were flat and floated on the air like leaves.