Scientists of University of Vermontand Tufts University have created the world’s first living and self-healing robots Xenobots, using stem cells from frogs. It is named after the African clawed frog, Xenopus laevis from which they take their stem cells. Key Points: The machines used are less than a millimeter (0.04 inches) wide which are small enough to travel inside human bodies. They can walk and swim, survive for weeks without food, and work together in groups. Xenobots could be used to clean up radioactive waste, collect micro plastics in the oceans, carry medicine inside human bodies, or even travel into our arteries to scrape out plaque.