Pop Quiz: Do You Know the Cool Facts About Cold, Hard Cash?

Recently, British writer Steve Boggan followed a $10 bill for a month, tracking its movements as it passed from person to person across America. In that time, as Boggan documented in his Twitter feed and in a later book, his sawbuck went from construction workers to grocery stores, bartenders to bankers, flowing through dozens of hands.

Forget flags and fireworks: When it comes to things that really hold America together, few things beat the little scraps of green and black paper that we keep in our pockets. These tiny pictures of Presidents and patriots pay for our necessities and feed our dreams, but how much do we really know about them? While researching U.S. currency, we compiled this little quiz. If you've ever wondered about the bills in your pocket, take a peek!

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