Since prehistoric times, peoples the world over have believed in a creative force that inspires life. Throughout history it has been known by many names: mana, prana, ka, and chi, to name only a few. Much has been written about this energy and the ways in which it can be strengthened to enhance life and well-being as well as provide the basis for many of the Eastern martial arts, particularly tai chi chuan. But if chi is real, why is there so little scientific evidence for its existence or for the physiological structures that generate and channel it throughout the body? Moreover, what is the exact nature of chi, and how can it interact with physical reality in the sometimes esoteric ways that are reported? The Wellspring draws together, for the first time, two significant but disparate lines of scientific research that not only identify the physiological structures that produce and channel chi but that point to the true nature of this mysterious power.