Why So Much of What We Know About Dementia Has Changed

As scientists make strides against dementia with new tests and drugs, Dr. Sanjay Gupta talks with journalist Robert Kolker about “The Vanishing Family,” his new book chronicling one family’s struggle with a particular form of the disease. Madeleine Thompson and Sofia Sanchez produced this episode with assistance from Andrew Quimby. Video production by Jilann…