Archelaus (philosopher) Archelaus (philosopher) Archelaus (; ; fl. 5th century BCE) was an Ancient Greek philosopher, a pupil of Anaxagoras, and may have been a teacher of Socrates. He asserted that the principle of motion was the separation of hot from cold, from which he endeavoured to explain the formation of the Earth and the creation of animals and humans. Archelaus was a philosopher of the Ionian School, called "Physicus" from having been the first to teach natural philosophy at Athens. This statement of Diogenes Laërtius, is contradicted by Clement of Alexandria, but the two may be reconciled by supposing that Archelaus
Hippo (philosopher) as arising from both mind and water. A medieval scholium on Aristophanes' "The Clouds" attributes to Hippo the view that the heavens were like the dome () of an oven covering the Earth. Hippo (philosopher) Hippo (; , "Hippon"; fl. 5th century BC) was a Pre-Socratic Greek philosopher. He is variously described as coming from Rhegium, Metapontum, Samos, and Croton, and it is possible that there was more than one philosopher with this name. Although he was a natural philosopher, Aristotle refused to place him among the other great Pre-Socratic philosophers "because of the paltriness of his thought." At some