Stuttering affects 1 percent of the adult population, equaling more than 3 million Americans.
Statistics suggest that males are affected three times more than females by the speech impediment.
It's somewhat of a mysterious ailment. People may stutter terribly and sing perfectly. It's a combinations of genetics and faulty neuromuscular development, and it almost always starts in pre-school. Doctors have said that many children go through a phase in their speech development when they may stutter. Carl Baum deals with the problem with his young son, Eli.