With a national debt approaching $17 trillion, Uncle Sam is tightening his belt and looking under the cushions for extra change. But a closer look at his pocket book reveals just how little he knows about where your money is going. Below are a few examples that will make you think twice about Uncle Sam’s accounting skills.

Readers: Some form of currency has been around for nearly as long as people have walked the earth. From bartering, to trading cattle, to swapping Bitcoins, the following infographic by www.mint.com explores the evolution of money. Best regards, Michael