by Claudine Zap The U.S. Mint has millions of them. They last years longer than paper money. Just one problem: Nobody uses them. They're that $1 coin that you probably confuse with your quarter if you have one in your pocket. Most likely, you don't. A story in the BBC points out that ever since a law passed in 2007 that requires four new $1 coins each year, the dollars have been piling up â€" with millions of them going unused.