The fastest supercomputer in the world has officially launched at the Lawrence Livermore National Laboratory (LNNL) in California. The supercomputer, called "El Capitan," cost $600 million to build and will handle various sensitive and classified tasks, including securing the U.S. stockpile of nuclear weapons in the absence of underground testing. It can reach a peak performance of 2.746 exaFLOPS, making it the planet's third exascale computer.