How do you unlearn the learned paralysis, so you can relieve him of this excruciating, clenching spasm of the phantom arm? Well, we said, what if you now send the command to the phantom, but give him visual feedback that it's obeying his command, right? Maybe you can relieve the phantom pain, the phantom cramp. How do you do that? Well, virtual reality. But that costs millions of dollars. So, I hit on a way of doing this for three dollars, but don't tell my funding agencies. (Laughter)