In the 5th cent. B.C. the Greek philosophers Democritus and Leucippus proposed that matter was made up of tiny, indivisible particles they called "atom", or in Greek ""a-tomos". The reason why they assumed this is because nothing can come from nothing. Democritus believed that all atoms were firm and solid, but they could not all be the same. If all atoms were identical, there would be no satisfactory explanation of how they could combine to form everything in different shapes. Democritus concluded atom with these ideal qualities:
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