most common theme of those paradoxes involved traveling a distance, but since that distance comprises infinite points, the traveler could never accomplish it. His most famous is the Achilles paradox, which is mentioned by Aristotelis: "The second is called the 'Achilles' and says that the slowest runner will never be caught by the fastest, because it is necessary for the pursuer first to arrive at the point from which the pursued set off, so it is necessary that the slower will always be a little ahead." (Aristotle Phys. 239b14–18 [DK 29 A26]) Melissus defended and advanced Parmenides' theory using prose, without invoking divinity or mythical figures. He tried to explain why we think various non-existent objects exist. The Eleatics' focus on Being through means of logic initiated the philosophical discipline of ontology. Other philosophers influenced by the Eleatics (such as the Sophists, Plato, and Aristotle) further advanced logic, argumentation, mathematics and especially elenchos (proof). The Sophists even placed Being under the scrutiny of elenchos. Because of the Eleatics reasoning was acquiring a formal method. The Pluralists: Anaxagoras and Empedocles The Pluralist school marked a return to Milesian natural philosophy, though much more refined because of Eleatic criticism. Anaxagoras was born in Ionia, but was the first major philosopher to emigrate to Athens. He was soon associated with the Athenian statesman Pericles and, probably due to this association, was accused by a political opponent of Pericles for impiety as Anaxagoras held that the sun was not associated with divinity; it was merely a huge burning stone. Pericles helped Anaxagoras flee Athens and return to Ionia. Anaxagoras was also a major influence on Socrates. Anaxagoras is known for his "theory of everything". He claimed that "in everything there is a share of everything." Interpretations differ as to what he meant. Anaxagoras was trying to stay true to the Eleatic principle of the everlasting (What-is) while also explaining the diversity of the natural world. Anaxagoras accepted Parmenides' doctrine that everything that exists (What-is) has existed forever, but contrary to the Eleatics, he added the ideas of panspermia and nous. All objects were mixtures of various elements, such as air, water, and others. One special element was nous, i.e., mind, which is present in living things and causes motion. According to Anaxagoras, Nous was one of the elements that make up the cosmos. Things that had nous were alive. According to Anaxagoras, all things