Leucippus (c. 450 BCE) (nov 7, 490 BC – nov 7, 430 BC)
Description:
Presocratic philosopher and atomist who opposed the Eleatics and argued that everything that happens is strictly determined by rational laws. His views were more fully developed and expressed by Democritus and Epicurus.
Recommended Reading: George Sarton, Ancient Science Through the Golden Age of Greece (Dover, 1993) and C. C. W. Taylor, The Atomists: Leucippus and Democritus (Toronto, 1999).