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DAVID GREENE, HOST:

The NCAA men's basketball tournament resumes tomorrow. Louisville plays Wichita State and Syracuse faces Michigan. On the women's side, it's Louisville again. They're playing California. Notre Dame is playing Connecticut. These quartets of teams, of course, are known as the Final Four, and this stage in the tournament is a resume booster for teams and coaches. NPR's Mike Pesca ponders the question of why college basketball, unique among major team sports, celebrates the semi finalists.

Bitcoin is a virtual currency that's traded online. It's been on a wild ride lately, soaring in value during the Cyprus banking crisis. And this week, the price plummeted after a Bitcoin trading exchange was hacked.

The computer maker's chairman Ray Lane has stepped down as executive chairman. He's been on thin ice with shareholders after his role in acquiring a business software company ended up hurting HP's bottom line.

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DAVID GREENE, HOST:

We have been hearing a lot about North Korea and nuclear weapons lately. Well, nuclear negotiators have just wrapped up a first day of talks on Iran's nuclear program. Tehran does not have nuclear weapons and insists it doesn't want them, but six world powers say the country must do more to assure the world that its program is entirely peaceful. We spoke earlier with NPR's Peter Kenyon, who is in Almaty, Kazakhstan for the talks. Peter, good morning.

PETER KENYON, BYLINE: Good morning, David.