This report originally ran on Jan. 7, 2007.
There are more than 3 million Americans whose spoken words might sound as if they were doctored by a disc jockey. Unexpected pauses, frequent repetitions and stretched sounds make saying "hello" seem to take an eternity. These people are stutterers.
Dennis Drayna, a geneticist at the National Institutes of Health, says that stuttering "is one of the great medical mysteries of [all] time." Scientists aren't sure what causes the condition, but a new...Full Story