Argonne National Laboratory plans to build the world’s fastest supercomputer, with help from chipmaker Intel, computer-maker Cray and more than $500 million from the U.S. Department of Energy. The machine, called Aurora, will be the first exascale computer in the U.S., capable of 1 quintillion—or 1 billion-billion—calculations per second. It will put Argonne, and Chicago, at the bleeding edge of computing.