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SPEED fanatics that they are, computer nerds like to check the website of Top500, a collaboration between German and American computer scientists that keeps tabs on which of the world’s supercomputers is the fastest. On November 12th the website released its latest list, and unveiled a new champion. The computer in question is called “Titan”, and it lives at Oak Ridge National Laboratory, in Tennessee. It took first place from another American machine, IBM’s “Sequoia”, which is housed at Lawrence Livermore National Laboratory, in California. These two machines have helped reassert America’s dominance of a list that had, in the past few years, been headed by computers from China and Japan.