"Who sees with equal eye, as God of all, A hero perish or a sparrow fall, Atoms or systems into ruin hurl'd, And now a bubble burst, and now a world."

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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.

— John Dalton