Learning from the Past

We begin today with a look at our public health infrastructure, and whether it’s prepared to handle a terrorist attack. Then, the celebrated pianist Helene Grimaud talks about her other life as an activist for wolves. And we hear about one man’s search to find his troubled twin brother--who disappeared when they were 28 years old. Plus, Nicholas Lemann exposes the campaign of political terrorism he says white Southerners waged to keep blacks from voting after the Civil War.