Anaximenes

He was from Miletus, same as [Thales](ThalesofMiletus) and
[Anaximander](Anaximander), and they all might have existed at the
same time. Anaximenes believed that the **source of all things is *air*
or *vapor*** \[1\]. Water exists in air untill pressed out. At higher
pressure it convert to water and then later to ice.

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References:

1.  Sophie\'s World by Jostein Gaarder