Supercomputers are machines that, as of 2015, could compute quadrillions of floating-point operations per second. That is, their performance is multiples of 1015 operations per second. These machines are used for a variety of things, including simulating earthquakes, nuclear reactions, and the big bang.
In fact, supercomputer simulations have at this point replaced the testing of actual nuclear arms. Some of the advantages to these simulations include:
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