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I believe that the least remarkable of Democritus' very great contributions was his "atomic theory", which was basically accepted by modern science 2000 years later (with some refinement and modification). His atomic theory was naturally highly suggestive of some quantum phenomena also. The most remarkable thing about Democritus' Atomic Theory was that he devised it by violating every major principle of modern science, especially the importance of empirical observations and "reasonable" testability. (Could he have developed …

…Nature des Acides (1778), he demonstrated that the "air" responsible for combustion was also the source of acidity. The next year, he named this portion oxygen (Greek for acid-former), and the other azote (Greek for no life). He also discovered that the inflammable air of Cavendish which he termed hydrogen (Greek for water-former), combined with oxygen to produce a dew, as Priestley had reported, which appeared to be water. http://scienceworld.wolfram.com/biography/Lavoisier.html