Tens of millions of people around the world live with chronic pain - many in such severe pain they are disabled by it. The Institute of Medicine estimates that chronic pain costs the U.S. alone $560 to $635 billion a year in direct medical costs and lost productivity. Morphine, an effective painkiller, costs only three cents a dose, yet because of excessive regulation in many countries, it is unavailable to millions of people who need it, even at...