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Politicians in Washington hardly let a few minutes go by without mentioning how broke the government is. So, it's a little surprising that they've created a stash of more than $1 billion that almost no one wants.

Unused dollar coins have been quietly piling up in Federal Reserve vaults in breathtaking numbers, thanks to a government program that has required their production since 2007.

And even though the neglected mountain of money recently grew past the $1 billion mark, the U.S. Mint will keep making more and more of the coins under a congressional mandate.

The pile of idle coins, which so far cost $300 million to manufacture, could double by the time the program ends in 2016, the Federal Reserve told Congress last year.