Tuff bot. While you sit at home worried that a robot’s about to take your job, researchers are scrambling to build bots that can do the jobs you don’t want to, go where you can’t, and, potentially, save your life. Usually, scientists have to build special environments or travel to treacherous terrain to push their robots to the limits. This week, however, the Polar Vortex provided an unexpected windfall for one robot and its keepers. What Cassie the bipedal robot learned in the brutal cold could one day help save your life.