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Democritus (greek: Δημόκριτος)(ca. 460 - ca. 370 BCE) was an ancient Greek philosopher, the most prolific and influential of the pre-Socratics and whose atomic theory is regarded as the intellectual culmination of early Greek thought. For this atomic theory, which echoes eerily the theoretical formulations of modern physicists, he is sometimes called the "father of modern science." He was well known to Aristotle, and a thorn in the side to Plato - who advised that all of Democritus' works be burned. A cheerful and popular man with the citizenry for his uncanny ability to predict events, his was known among his fans as the "Laughing Philosopher," a title that may well have referred more to his scoffing rejection of assigning to gods the mechanistic operations of nature itself. His cosmology and atomic theory held that the world was spheroid, that there were many worlds and many suns, and that all things manifest in nature were comprised of atoms bound together. There are varying accounts of his age at death, ranging from a ripe 90 all the way to 109 years.
"Empedocles (c. 490 – c. 430 BC) was a Greek pre-Socratic philosopher and a citizen of Agrigentum, a Greek city in Sicily. Empedocles' philosophy is best known for being the originator of the cosmogenic theory of the four Classical elements. He also proposed powers called Love and Strife which would act as forces to bring about the mixture and separation of the elements. These physical speculations were part of a history of the universe which also dealt with the origin and development of life. Influenced by the Pythagoreans, he supported the doctrine of reincarnation. Empedocles is generally considered the last Greek philosopher to record his ideas in verse. Some of his work survives, more than in the case of any other Presocratic philosopher. Empedocles' death was mythologized by ancient writers, and has been the subject of a number of literary treatments. Empedocles is considered the last Greek philosopher to write in verse and the surviving fragments of his teaching are from two poems, Purifications and On Nature." — Wikipedia
