Image Gallery: Government's 10 Most Powerful Supercomputers
The United States government owns many of the most powerful supercomputers in the world, including six of the top ten. These supercomputers are being used for everything from climate modeling to building spaceships to basic science research.
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Sandia National Laboratory's Red Sky comes in at number 10 on the Top500 list. Red Sky's been researching (among other things) future sources of energy like biofuel, and the computer has also been lauded for its energy efficiency. There's an excellent time lapse video of Red Sky being built, which can be seen on YouTube.