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Born this day 1766 John Dalton English physicist and chemist who developed the atomic theory of matter and researched color blindness, in Eaglesfield, England. "It's the right idea, but not the right time." "Matter, though divisible in an extreme degree, is nevertheless not infinitely divisible. That is, there must be some point beyond which we cannot go in the division of matter. ... I have chosen the word “atom” to signify these ultimate particles." "If I have succeeded better than many who surround me, it has been chiefly - may I say almost solely - from universal assiduity."