Abstract
This study will analyze the origin and development of scientific thought in Antiquity, especiallyin the Greek World, which will largely arise thanks to the doctrines of the so-known as Pre-socratic philosophers, whose reflections and postulates will lay the foundations for a new form of thought that, unlike the one that existed up to that point, was freed from any magical-religious influence with the aim of providing a rational explanation to the different phenomena of nature and of the Universe.