The penny is worthless. Actually, it's worse than worthless. We lose money minting each copper Lincoln face. It's waste and a bother and we should kill it forever.

The $1 coin is a different story. Americans won't use it, but they should. Since coins last longer than paper notes, replacing the dollar bill with the coin could save us up to $700 million every year in printing costs. Instead, our love affair with the greenback is breaking the back of the U.S. mint:

In hidden vaults across the country, the US government is building a stockpile of $1 coins. The hoard has topped $1.1bn - imagine a stack of coins reaching almost seven times higher than the International Space Station - and the piles have grown so large the US Federal Reserve is running out of storage space.

Read the full story at the BBC.

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