Anaximenes (Greek: Άναξιμένης) of Miletus (c. 585 BC-c. 525 BC) was a Greek Pre-Socratic 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.[1]
Anaximenes, like others in his school of thought, practised material monism, the idea that underlying reality is one single thing.[2][3]
For him, the primary substance was air.[3] it was an attempt to find a natural way to explain the world.