"Chasing the Plague" looks at the societal impacts of the bubonic plague on medieval Europe as scientists today track down the earliest known bubonic plague victims. They are studying the virus in hopes of preventing future outbreaks. What happens when a third of a continent's population is wiped out?

There are only two accepted portraits of William Shakespeare that are considered "official," but a portrait that's been hanging over a mantlepiece for the last 50 years could be the third. It could be worth as much as $200 million…if it is genuine.