Bitcoin

Software engineer Mike Caldwell shows the front of a physical Bitcoin he minted in his shop on April 26, 2013 in Sandy, Utah. Bitcoin is an experimental digital currency used over the Internet that is gaining in popularity worldwide.

( George Frey / Getty Images )

Software engineer Mike Caldwell shows the front of a physical Bitcoin he minted in his shop on April 26, 2013 in Sandy, Utah. Bitcoin is an experimental digital currency used over the Internet that is gaining in popularity worldwide.

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