Pre-Socratic philosophy is ancient Greek philosophy before Socrates (and includes schools contemporary to Socrates that were not influenced by him). In Classical antiquity, the Presocratic philosophers were called physiologoi ( in English, physical or natural philosophers). Aristotle called them physikoi ("physicists," after physis, "nature") because they sought natural explanations for phenomena, as opposed to the earlier theologoi (theologians), whose philosophical basis was supernatural. Diogenes La rtius divides the physiologoi into two groups, Ionian and Italiote, led by Anaximander and Pythagoras, respectively. It may sometimes be difficult to determine the actual line of argument some Presocratics used in supporting their particular views. While most of them produced significant texts, none of the texts has survived in complete form. All that is available are quotations by later philosophers (often biased) and historians, and the occasional textual fragment. The Pre-socratic philosophers rejected traditional mythological explanations of the phenomena they saw around them in favor of more rational explanations. These philosophers asked questions about "the essence of things." - From where does everything come? - From what is everything created? - How do we explain the plurality of things found in nature? - How might we describe nature mathematically? Others concentrated on defining problems and paradoxes that became the basis for later mathematical, scientific and philosophic study. Later philosophers rejected many of the answers the early Greek philosophers provided, but continued to place importance on their questions. Furthermore, the cosmologies proposed by them have been updated by later developments in science. This book outlines the history and contributions of 38 major pre-socratic philosophers and scientists. This book is designed to be a general overview of the topic and provide you with the structured knowledge to familiarize yourself with the topic at the most affordable price possible. The level of discussion is that of Wikipedia. The accuracy and knowledge is of an international viewpoint as the edited articles represent the inputs of many knowledgeable individuals and some of the most currently available general knowledge on the topic based on the date of publication.