Happy Birthday! You are so money!

Paper money was first introduced today in 1862.

Getty Images George Marks

The notes were $5, $10 and $20. These notes were redeemable in coin on demand, which is why they were called "Demand notes." But because of the green ink used to print these notes they became known as Green Backs.

The largest denomination ever printed was the $100,000 Gold Certificate of 1934 featuring the portrait of Woodrow Wilson. This note existed only for official transactions and none of them ever circulated outside Federal Reserve banks.

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Currently, the highest denomination  bill in circulation is the $100 bill after President Nixon told the Federal Reserve to take the high-denomination bills out of circulation in 1969 as an anti-drug measure.

As of 2009 there were only 336 of the $10,000 bills in circulation,

342 remaining $5000 bills; and 165,372 $1000 bills still being used.

But they're NOT really being used! If you have one, it's worth so much more to collectors than just the face value!