During WWII, the US government recalled all paper currency circulating in Hawaii and replaced it with notes stamped with “HAWAII”. In the event of a Japanese invasion of Hawaii, all currency captured would be easily identifiable and would be rendered worthless.
The $2 bill makes up 1% of currency circulation. Its scarcity in daily use has confused some merchants who believe the bill to be fake. A 13 year old girl in Texas was detained by police when she tried to pay for her school lunch with a $2 bill, because the school’s counterfeit pen wouldn’t work on it.
Botswana’s currency is named Pula which literally means “rain” in their official language. This is because rain is very scarce in Botswana — home to much of the Kalahari Desert — and therefore valuable and a blessing.
There is an island in the pacific called Yap that uses circular stones as currency. The stones are too large to move so the ownership of the stones is passed by word of mouth to transact business. The location of the stone is irrelevant even in the case of one lost on the bottom of the sea.
One of the most well known Presidents of the USA, Theodore ‘Teddy’ Roosevelt, was against putting “In God We Trust” on currency, saying it would “… cheapen such a motto by use on coins, postage stamps, or ads”.
Ecuador uses the USD as their official currency, and prefer using the Sacagawea dollar.
There is an African Union which aims to have a currency union similar to the Euro. One suggested name for this currency union is the “Afro.”
Theodore Roosevelt was against the phrase “In God We Trust” on currency as he considered it sacrilegious.
Only 8% of the world’s currency is physical money, the rest only exists on computers.
Photoshop detects if you are trying to edit an image of currency, and attempts to stop you from opening/printing the file.