Sequoia, an IBM supercomputer at Lawrence Livermore National Laboratory in California, was on June 18, 2012 named No. 1 on the TOP500, a list of the world’s fastest supercomputers. Sequoia — part of IBM’s BlueGene/Q line and based on the company’s POWER architecture — runs at more than 16 petaflops (or more than 16 quadrillion calculations a second). Lab and IBM Research leaders here mark a collaboration that has produced six of the most powerful supercomputers in the world over 14 years. Available for download on Flickr.