Born: 545 B.C. Anaximenes of Miletus was a Greek philosopher from the latter half of the 6th century, probably a younger contemporary of Anaximander, whose pupil or friend he is said to have been. He held that air, with its variety of contents, its universal presence, its association with the phenomena of life and growth, is the source of all that exists. Everything is air at different degrees of density, and under the influence of heat, which expands, and of cold, which contracts its volume, it gives rise to the several phases of existence. (Source)
