When is 50 bucks worth a whole lot more than 50 bucks? When it's a rare 50-dollar bill worth thousands of dollars! Don't ...

In an effort to improve the security of the monetary system, the Bureau of Engraving, the Secret Service ... issues dollar bills in seven denominations: $1, $2, $5, $10, $20, $50, and $100.

Artist Dan Tague has found hidden messages encrypted in U.S. dollar bills. He would fold a dollar bill as many as 100 times to come up with phrases made up by the letters on the money. Tague's ...