Second in a five-part series that presents recent research on the brain. This episode shows that nowhere is learning more dramatic than in the way a child learns language. Examines this process, particularly the role of the left versus the right brain centers, and what can happen when the left hemisphere is damaged by disease. Tells the story of Michael Rehbein, who had to have the left hemisphere of his brain removed to control seizures caused by a rare brain disease. Dana Boatman at Johns Hopkins University, who has been testing Michael ever since his operation, wants to know how the right side of his brain has compensated.