When it came to pratfalls, the DARPA Robotics Challenge (DRC) did not disappoint. The roughly three-year competition to build disaster-ready robots came to a head last weekend at the Fairplex in Pomona, California, and much of the coverage of the event has focused on robots falling over. Fair enough. But there was more to the DRC than the mingled joy and pain of watching anthropomorphic machines destroy themselves in front of a gasping crowd. Here's a closer look at how this landmark contest played out.