How much do you know about the money in your pocket? We use it almost every day and yet many of us don't know a whole lot about it. These facts about US coins and currency provide a behind-the-scenes look at how coins are made, how long money stays in circulation, how to spot counterfeit bills and many other interesting facts. For instance, did you know there is more than $571 billion in circulating currency?

And I thought Where's George was doing well having tracked $235 million in bills.