We've seen nanobots do some neat stuff so far (aquatic dance routines immediately come to mind), but them administering drugs inside a living organism's been the stuff of scientists' dreams. Researchers at the University of California San Diego, however, recently made it a reality by successfully administering acid-powered, zinc-based, self-destructing micromotors inside living mice. The ultra-tiny 'bots measured in at 20 micrometers long, roughly a human hair's width, and are tough enough to survive the harsh gastrointestinal environment autonomously. What's more, they destroy themselves without leaving any traces of harmful chemicals behind and being self-propelled apparently was a factor in "greatly improved" tissue penetration and drug retention. As the BBC points out, this would make them great for treating maladies like peptic ulcers and other stomach disorders.