Nation

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American and foreign dignitaries paid final respects to former Pres. Ronald Reagan at a state funeral in Washington before his body returned to California for burial at sunset. Kwame Holman narrates an extended summary of the day's events.

Terence Smith visits the Bettmann Archive, one of the world's most renowned private collections of historical photographic and graphic images, and explores the arduous process of preserving delicate historic images.

As America remembers Ronald Reagan, renewed attention is focused on Alzheimer's. Terence Smith discusses Alzheimer's disease and efforts to treat it with Dr. Ron Petersen, director of Alzheimer's Research at the Mayo Clinic and the first physician to diagnose President…