Word: leucippus
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...laser theory in the late 1950s. If one is to search any farther back for a causative scientific theory, one must not be so shortsighted as to focus on 1917. The actual origin of the theory that made the laser possible must be credited to the Greek scientists Leucippus (fl. 5th century B.C.) and Democritus (460-370 B.C.), who originated the atomic theory and also coined the word atom (Greek for not + cutting, indivisible...
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