Toughest Reference Librarian Questions

Part of why I love reference work (even though it isn't my strongest suit as a librarian) is that you get to learn cool stuff. So I thought that this article, "What are the toughest questions tossed at reference librarians?" was a very neat one!

Let me just say, the questions mentioned in this article are tough. If confronted with one, I think I'd look like this...

Have you had any especially difficult or amusing reference questions?