He said that everything in the world was made up of tiny bits, surrounded by empty space. He also said that these bits vary in size and shape. He called them "atomos". Most of the scientists during that time disagreed with him. (dec 31, 441 BC – sep 6, 440 BC)
Added to timeline:
Date:
dec 31, 441 BC
sep 6, 440 BC
~ 1 years and 3 months