Teams of engineers from MIT, Google, Lockheed Martin, and other institutions and companies replaced parts, ran last-minute tests, and ate junk food. It was the start of the Robotics Challenge Trials, a competition put on by the Defense Advanced Research Projects Agency (DARPA), the branch of the US Department of Defense dedicated to high risk, high reward technology projects. And one day, DARPA says, these robots will be defusing roadside bombs, surveilling dangerous areas, and assisting after disasters like the Fukushima nuclear meltdown. Mark Gubrud, a former nanophysicist and frumpy professor sort, fit right in with the geeky crowd.