What Off-The-Shelf Item Did The United States Air Force Build a Supercomputer From?
  1. Graphing Calculators
  2. Graphics Cards
  3. PlayStations
  4. Raspberry Pi Units

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via How-To Geek http://www.howtogeek.com/trivia/what-off-the-shelf-item-did-the-united-states-air-force-build-a-supercomputer-from/