1. US paper money is not paper. Ita��s cloth. In Ben Franklina��s day, people repaired torn bills with a needle and thread.
2. Serial numbers are not just numbers. They also use letters as part of the alphanumeric code for the 12 US Federal Reserve Banks.
3. The ink used for money is high tech a�� very high tech. It has trackable, magnetic, and birefringent (color changing) properties.
4. The US Mint mutilates coins that are found defective. Culls are run through a a�?wafflinga�? machine before being sent for recycling, eliminating the need for armed guards.
5. The blue ribbon woven through the new hundred dollar bill contains thousands of micro lenses that make the Liberty Bell appear to dance (and make me feel like Ia��m looking through someone elsea��s eyeglasses).
6. A farm in Delaware mulches more than four tons of US cash into compost every day. In previous eras, worn out bills were pierced or burned.
7. The first US cents were 100 percent copper, while todaya��s pennies are 95 percent zinc with a copper coating measuring only 1/2000th of an inch (as thin as cellophane tape).
8. Pennies buried in a garden will repel slugs, which get electric shocks from touching copper and zinc.
9. US banknotes are made on $7 million Swiss Super Orlof printing presses that exert 60 tons of pressure to force ink into cloth. Prized for their distinctive texture, US banknotes are the finest quality engravings being produced in the world today.
10. Each color has its own physical characteristics. Green was selected for US dollars because ita��s the most resistant to fading, flaking, and discoloration.
11. Counterfeit dollars can be too good. Fakes are frequently detected because they are more perfect than authentic money.
12. Sailors used to pass the time by banging on the edge of coins with the heel of a spoon, then cutting the middle out of the thickened rims to make rings for their loved ones.
13. Ninety percent of US$ bills carry traces of cocaine.
14. The first credit card was created because of the embarrassment of a man who had to pay for dinner but forgot his wallet.
14. All US$ coins and bills in circulation today are worth US$1,2 trillion. a�� Online