What's the world's fastest supercomputer used for?

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"The world's fastest supercomputer will probably never be known at the world's fastest supercomputer. RIKEN's MDGrape-3 is the first machine to break the petaflop barrier -- that's 1 quadrillion calculations (floating-point operations, to be specific) per second -- and it's three times faster than the currently ranked fastest computer in the world,"

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