Those U of Penn. Researchers have not only created a Poop Scoop, their MODLAB has a robot that can build and repair others or itself with spray-on foam and modular parts. The FoamBot is a wheeled cart with jointed modules that can spray to connect them to each other. The basic plan here is to develop a robot that can handle unknown emergencies quickly and cheaply. It's no surprise that they can be used in military applications, planetary endeavors and disaster relief, not to mention building several versions of itself for the eventual planet takeover.