NYU researchers identified 3,000 types of bacteria on dollar bills. The most often found bacterium causes acne.
The penny costs 2.4 cents to produce and indirectly diverts resources driving up the cost of production for the nickel to over twice its value.
Minting of the U.S. half-penny was discontinued in 1857 because it was viewed as having too insignificant purchasing power and wasteful to continue minting. Adjusted for inflation it would be worth more than the penny, nickel, and dime today.
Laundering money — literally — could save billions of dollars: Scientists have developed a new way to clean paper money to prolong its life, rather than destroying it. The research could save billions and minimize the environmental impact of banknote disposal.
In 1700s, the deer skin was a common medium of exchange between the trading settlers and the native Red Indians in America. This is how a buck became a slang for a dollar.
A pound of any combination of dimes, quarters, and half-dollars is worth $20.
The 1 yen coin can be used as a weight, because it weighs exactly one gram. Also, it can float on water.