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The last $250 reportedly went to charity. Popular Science reported at the time that the MIT group won by creating monetary incentives similar to a multi-level marketing scheme for help finding the balloons: $2000 per balloon to the first person with correct location coordinates, $1000 to whoever recruited the person, $500 to whoever recruited the recruiter, and $250 to the recruiter of the recruiter. The competition was put on by the Pentagon's Defense Advanced Research Projects Agency (DARPA) on December 5, 2009.
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The Pentagon once hid 10 giant red balloons across the US, offering $40,000 to whoever located them all - and a group at the Massachusetts Institute of Technology won the 2009 competition in less than seven hours.
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