Soon it may be possible to prevent heart attacks by an injection of nano-particles into the bloodstream, according to the newest research paper from the scientists at Columbia University Medical Hospital and Brigham and Women's Hospital. Heart disease is the leading cause of death in America. A large part of that is atherosclerosis, or hardening of the arteries. This occurs as plaques build up along the inside of the arterial wall. The research team created targeted nano-particles designed to heal atherosclerosis. This is the latest discovery in a growing field of pint-sized medical discoveries. We've seen robots that can swim inside your eyeball and smart pills, but nothing as small as this nano-treatment.