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460 BCE
450 BCE
440 BCE
430 BCE
420 BCE
410 BCE
400 BCE
390 BCE
380 BCE
370 BCE
460 BCE - 370 BCE: Life of Democritus, pupil of Leucippus; development of the concept of the atomic universe.
445 BCE: Leucippus of Abdera, the philosopher, is said to have conceived of the atomic universe. His pupil is Democritus.