20/20: Medical Mysteries/Age of Consent

In the first hour, Medical Mysteries, 20/20 reports on people who uncontrollably pull out their hair; people who have no fingerprints; a man who hears the internal "symphony" of his body; and "selective mutism." In the second hour, Age of Consent, 20/20 reports on sex offender registries, sexual consent of minors, and on boys, girls, and sex in America.