Binaural Beats are weird. Discovered in 1839 by Heinrich Wilhelm Dove, a German physicist and meteorologist, they're auditory processing artifacts created when you play sounds of slightly different frequencies to each ear. A beating tone is percieved, as if the tones mixed outside the brain. The weird bit, however, is that they appear to entrain brainwaves, producing relaxation and health benfits. Enter the FeelFree headset...