Schumann's Resonance is the frequency of the magnetic field that surrounds the earth. Listening to this frequency stimulates the natural production of hormones that rejuvenate cells and keep the body young. The electric noise of cities drowns out Schmann's Resonance, making people feel out of touch. Notice that you feel better far out in nature? Some say it's not just the fresh air, it's the body's ability to be in tune with this frequency. Very relaxing, in any case.