What is Thales' leap?

Thales' leap refers to a significant philosophical transition attributed to the ancient Greek philosopher Thales of Miletus, who is often considered the first philosopher in Western history. It marks the shift from mythological explanations of the world to rational, naturalistic explanations based on observation and reasoning. Thales proposed that water is the fundamental substance of all things, illustrating an early attempt to understand the nature of reality through a single underlying principle. This leap laid the groundwork for subsequent philosophical and scientific inquiry.