Micro-rocket--in your stomach

Micro-rockets powered internally by hydrogen, shooting through your stomach at super fast speeds of 100 body lengths per second, carrying with them urgently nedded drugs, and releasing them at the diseased sites-- it sounds like a fairytale but it is true. Scientists at the University of California, San Diego, have developed hydrogen bubble-powered micro-rockets that can be steered to the targeted sites and release their pay loads. These micro-rockets are tiny 10 micrometre long polyaniline tubes with a diameter of a few micrometres. The tubes are lined internally with zinc that reacts with acid in the stomach to generate hydrogen bubbles. These bubbles propel the tubes forward at high speeds reaching 380 mph, depending on the pH of the stomach. The tubes can be coated on the out side with magnetic materials, thereby allowing them to be guided magnetically to a targeted site.