http://www.mindbites.com/lesson/10498 for full video. Something frightening is happening to the citizens of the developed world. Despite major advances in health care, over recent decades we've been battling an ever-growing epidemic of once rare allergic and autoimmune diseases. Today, more than 17 million people in the U.S. alone struggle to maintain one of their body's most basic body's functions — breathing. Another 50 million are now thought to be coming under regular attack by their own immune systems, and that number grows every day. A similar pattern has emerged in modern cities and communities across the planet. Even as we've improved hygiene, developed antibiotics and implemented vaccination programs, the number of walking wounded has skyrocketed. It's a desperate and puzzling situation that has sufferers and scientists alike scrambling for answers."