The folk seem to think that science can "prove" things. I used to think this just meant that they were confused about how science works. But there is a more charitable reading, which I got from a comment by Dan Johnson on prosblogion. Rather than taking the folk to be confused about how science works, we can take seriously the idea that meaning is a function of use, and take the folk to simply use the word "prove" differently from how philosophers do. The legal sense of "prove", as in "prove beyond reasonable doubt", seems to prove the point. :-) For if it is not otiose to specify that a proof is "beyond reasonable doubt", it must be possible to prove in a way that admits doubt! And hence a "proof", in the ordinary sense of the word, does not mean what philosophers and mathematicians mean by the word.