article: Pre-Socratic philosophy
links: Eleatics Parmenides Protagoras Milesian school Pythagoreanism Sophism Anaximenes of Miletus Pythagoras Hippias Atomism Anaximander Zeno of Elea Empedocles Scientific method Gorgias Philolaus Socrates Ancient Greece Rationalism Solon Anaxagoras Leucippus Xenophanes Thales Democritus Heraclitus