Rice-sized robot could make brain surgery safer and less invasive Surgeries may become safer and more precise than ever before. NEW You can now listen to Fox News articles! For decades, microscopic robots lived mostly in our imagination. Movies like "Fantastic Voyage" convinced us that tiny machines would one day cruise through the human body, fixing problems from the inside. In reality, that future stayed frustratingly out of reach.  The reason was not a lack of ambition. It was physics.  Now,