NTT DoCoMo has created headphones that sense eye movements. For instance, you can look from right to left to pause your music. Look right, then right again, to skip to the next track. Roll them clockwise to raise the volume…. They sense the movements of the eyeballs by measuring tiny changes in electric charge. It turns out that the cornea, the outer surface of the eyes, has a positive charge. When you look left, the resulting shift in the electrical charge can be detected as far away as the ears.