Strange how things come up several times together. This BBC article (http://www.bbc.co.uk/news/world-us-canada-10783019) talks about the growing dollar coin 'mountain' beacuse Americans don't like them, and also says that the USA is the only G8 country which still has its base currency in note (bill) form, all of the others use coins for the "One Unit" amount (several for two unit as well).

I wonder, is the USA the only country which also has all of its paper money the same size and colour whatever the denomination? All the others I know use different colours and sizes depending on the value (the size differences help colour-blind people).