"Ancient Greek Philosopher-Scientists" delves into the thoughts and ideas of the Pre-Socratic philosophers, who paved the way for rational inquiry into the natural world, setting themselves apart from traditional religious explanations. This collection presents the fragments of their works, alongside testimonials from later authors, highlighting their foundational role in the development of philosophy and science. Their quest for knowledge and understanding of the universe continues to resonate today, reminding us of the enduring human desire to seek rational explanations for the mysteries of existence.