When you're sick, it's obvious that you and your doctor should work, if possible, to help you get better. Nobody would argue against a treatment that restores normal function to a sick or disabled individual. But the consequences of going further than that--going beyond "normal"--are not commonly studied, nor endorsed by many in medicine. Indeed, in any medical procedure, there is risk. If you are already normal, then conventional wisdom dictates that that's enough. "Do no harm," the old aphorism says--we should focus on altering the body and mind only when the risk of the alteration is justified, preferably by the hope of solving a deficit of vastly greater magnitude. ...