Here in the United States, money talks. The well-traveled, green bank notes criss-cross the country, often carrying tales of previous owners as well as a handful of microbial surprises.
Millions of dollars are printed daily, and in the Money section, we regularly follow these bills, trying to figure out why we never seem to have enough of them. We cover issues like how to save, plan for and manage our dollars. So for a change, we looked at the physical dollar bill a little more closely and found some surprising things.
Here are 10 things you probably didn't know about U.S. currency: