Alzheimer's prevention experiment, whooping cough outbreak JP Morgan Chase admits mistakes, 250,000 losing unemployment benefits JP Morgan Chase is admitting to mistakes that caused the banking giant to lose $2 billion and sent its stock price plummeting; Also, a quarter of a million Americans are about to lose their unemployment benefits; And, Steve Hartman reports on a teacher in one of the poorest school districts in Texas, whose students reach for the stars with rocket science.