Seeing and Perceiving

Oliver Sacks has an unusual problem.  He can't recognize other people's faces.  In fact, he doesn't always recognize himself when he's looking in the mirror.  Sacks is also a neurologist who's fascinated by brain disorders.  We'll talk with Sacks and with the painter Chuck Close, who also suffers from face-blindness.  In this hour of To the Best of Our knowledge, the many ways of seeing the world.