Scientists from the University of Vermont and Tufts University's Allen Discovery Center have created the world's first living, self-healing robots using living stem cells from frogs. These entirely new life-forms are called Xenobots, named after the African clawed frog from which they take their stem cells. The living machines are less than a millimeter wide - small enough to travel inside human bodies. They look like tiny blobs of moving pink flesh and are more environmentally friendly and safer for human health than traditional robots. Xenobots could be used to clean up radioactive waste, collect microplastics in the oceans or even carry medicine inside human bodies, the scientists shared.