“For millions of people, pain is a nightmare that cannot be escaped. According to the U.S. Institute of Medicine, part of the National Academy of Sciences, about 40 percent of adult Americans—100 million people—are experiencing chronic pain at any given moment. One-fifth of them will suffer it for more than twenty years.As Andrew Rice, a pain researcher at Imperial College London, told Nature in 2016, “The drugs we have relieve 50 percent of pain in somewhere between one in four and one in seven of the patients we treat. That’s for the best drugs.” In other words, some 75 percent to 85 percent of people get no benefit at all from even the best pain drugs, and those who do get benefit don’t usually get much. Bryson, Bill. The Body (p. 314). Knopf Doubleday Publishing Group. Kindle Edition. Bryson, Bill. The Body (p. 314). Knopf Doubleday Publishing Group. Kindle Edition. ”