"Danbury wasn't a prison, it was a crime school. I went in with a Bachelor of marijuana, came out with a Doctorate of cocaine."

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The propositions of mathematics have, therefore, the same unquestionable certainty which is typical of such propositions as "All bachelors are unmarried," but they also share the complete lack of empirical content which is associated with that certainty: The propositions of mathematics are devoid of all factual content; they convey no information whatever on any empirical subject matter.

— Carl Gustav Hempel