Every so often I feel I should try to get my head around calculus & some nice man offers me a book they say is “Not like all the other books.” And I read, once again, about a pissing match between Newton and Leibniz with a roller coaster on the cover. Basically there is a jump that happens between understanding the concepts (which I do) and understanding how to plug them into formulae (which I don’t understand) and I always wind up lost in the second half of these roller coaster books.