I know I'm not the only one who loves the smell of books - fresh, new books; old tomes; sometimes other kinds of paper that are not even bound into books. I don't know why I like it, but I do.
Scientists noticed that preservationists like to smell old books, and they started thinking about how that might help them do their job. Could they invent a machine that would "sniff" the paper, so the right kind of preservation technique can be used? Here's the article from Wired Science: "Judge an Old Book by Its Odor"