Question

Which ancient greek pre-socratic philosopher is famous for leaving bits and fragments of his philosophy, including riddles like "the sun is the width of a human foot," and "you cannot step into the same river twice"?

Answer 1

The name of that philosopher is Heraclitus
Heraclitus is one of the most famous greek philosophers around 500 B.C. Unlike any other philosopher, Heraclitus never follow any famous philosopher as his teacher. He was known for his effort in understanding the fundamental essentials of our universe.