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PBS looks at the origins of the agency's surveillance program and the extraordinary steps top government officials took to give it legal cover and keep it hidden.

The FBI wants to speak with "Misha," a man who relatives of the suspects say may have introduced Tamerlan Tsarnaev to radical Islam. Meanwhile, Dzhokhar Tsarnaev reportedly stopped giving information to investigators after being read his Miranda rights.

What if you put all 7 billion humans into one city, a city as dense as New York, with its towers and skyscrapers? How big would that 7 billion-sized city be? As big as New Jersey? Texas? Bigger? Are cities protecting wild spaces on the planet? We try a little experiment to find out.

An exciting women's NCAA basketball tournament ended with a dominant win by UConn in Tuesday's final game. ESPN's Pablo Torre talks with host Michel Martin about the game and other sports news.

Elected in 1956, Wisconsin state Sen. Fred Risser is the longest-serving state lawmaker in the country. He may not use Facebook, Twitter or email, but he's gotten a lot done over the years. Considered an "institution within an institution" by some, he was just re-elected for another four years.

Shug McGaughey is the trainer of Kentucky Derby winner Orb, who runs Saturday in the Preakness Stakes, the second leg of thoroughbred racing's Triple Crown. Despite his long record of success, no one seems as surprised as the 62-year-old McGaughey to be pursuing one of the sport's top honors.

Swiss authorities have arrested several FIFA officials suspected of both receiving and paying bribes. David Greene talks to Matt Apuzzo, one of the reporters working the story for The New York Times.

The presidential candidate, who has emerged as the leading critic to Hillary Clinton, sat down with WAMU's Diane Rehm to talk about his campaign, policies and his chances.

John Lewis is a congressman from Georgia, a pillar of the civil rights movement and an author. Lewis is getting ready to release March, the new graphic novel of his life.

First came the day trips for foreigner tourists to the shantytowns. Now, young Westerners are living in formerly no-go areas — with yoga classes and sushi restaurants following. Business is booming in Rio de Janeiro's favelas, but some residents complain they're being priced out of the market.