Once upon a time, a charming American robot called James met a striking German bot by the name of Rosie. They liked each other, so they moved in together. Now they spend their days taking long walks in the lab and doing other things that robots do.  James is a PR2 robot, built by U.S. robotics firm Willow Garage, and it traveled to Germany as part of the PR2 Beta Program, an effort to popularize personal robots. At the Technical University Munich (TUM), James was introduced to Rosie, a dual-arm robot with a curvy figure and four eyes. Their courtship was at first a bit mechanical, but they soon found many things in common: Both run ROS (Robot Operating System), use Hokuyo laser scanners and Kinect 3D sensors, and have omnidirectional mobile bases. On a recent spring morning, James and Rosie were seen together cooking the traditional Weisswurst Frühstück, a Bavarian sausage breakfast.