Perhaps one day you were sitting around at home, flipping through the fat stacks of cash you keep around, and the thought popped into your head: "What do all these strange symbols on the dollar bill mean anyway?" And then you might have paused, waiting for Nicolas Cage to appear and explain it to you. Well, sorry. That's just not how it works. Nicolas Cage isn't summoned anywhere for just a dollar. But we here at Mental Floss are happy to tell you a little about our national treasure—for free.