Thales of Miletus was an Ancient Greek philosopher that is regarded as being the father of philosophy. He was the first known individual to attempt a naturalistic approach of explaining the world rather than deriving his conclusions from mythological explanations.
Thales developed the philosophical view that all things in this universe must be derived from one singular fundamental entity. He posited that this fundamental entity is water. Thales’ reasoning was that it would explain natural phenomena such as change. He thought it could also explain the relationships between all of the many things in the universe.1