Tiny robots that fight cancer? Shock-resistant and energy-absorbing body armor? Invisible disinfectants? Is this all science fiction or impending reality? The hype surrounding nanotechnology has waned since the early '80s when American engineer Dr. K. Eric Drexler brought the concept to the forefront, but what began as a simple topic of conversation at physicists' cocktail parties is now being realized in a sweeping movement that is going largely unnoticed.