Arlo, Nancy and Janice each have a 50/50 chance of developing a devastating nerve disorder. A laboratory test can tell them if in fact they will fall victim. In their shoes, would you take the test? Thousands of others face a similar choice: to know, or not know, if they will carry the genetic time bomb of Huntington's disease. NOVA looks at this incurable disease which affects 20,000 people in the US and threatens tens of thousands of others.
In an Idaho classroom, teacher Phil Gerrish puts an unorthodox interpretation on the day's biology lesson. As students take notes, he explains that creationism is a valid scientific explanation for the origin on life. Once relying solely on the literal word of the Bible to make their case, creationists now argue that the scientific evidence is on their side. NOVA reports on this new twist in the long-running battle between creationism and evolution.