Morning Edition

Backed by the federal government, doctors in Michigan are trying to expand the use of a controversial form of organ donation that raises disturbing ethical concerns, including questions about whether the donors are really dead. Defining dead turns out to be pretty complicated. There are two ways to declare someone dead.

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RENEE MONTAGNE, HOST:

Pope Benedict stuck to mostly spiritual themes on a visit to communist Cuba's most sacred shrine. This morning, the pontiff leads a mass in Havana's Plaza of the Revolution. As Nick Miroff reports from Havana, so far even Benedict's gentle push for greater religious and political freedoms for Cubans has been rejected by the government.

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RENEE MONTAGNE, HOST:

Florida state investigators are continuing to look into the shooting death of Trayvon Martin. His family has been part of a widespread campaign calling for the arrest of the neighborhood watch volunteer who shot and killed the 17-year-old high school student. Yesterday, the parents of Trayvon Martin were up on Capitol Hill attending a forum on hate crimes and racial profiling. NPR's Sonari Glinton reports from the Capitol.

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DAVID GREENE, HOST:

Now, if the health care law survives constitutional scrutiny, the Republicans who are running for president have vowed to repeal the law if elected. One GOP candidate now appears less likely to have that opportunity. Newt Gingrich is short on victories and low on cash, and he is dramatically shrinking his campaign for president.

Folklorist Alan Lomax spent his career documenting folk music traditions from around the world. Now thousands of the songs and interviews he recorded are available for free online, many for the first time. It's part of what Lomax envisioned for the collection — long before the age of the Internet.

This year's Final Four seems more like Best in Show at the Westminster. Such pedigree: Kentucky, Kansas, Ohio State and Louisville –– four of the very top dogs in the history of the sport. Well, it's a Meryl Streep kind of year, isn't it?

But if the Final Four might delight fans by giving them aristocracy in its teams, unfortunately the whole of college basketball is plagued by anonymity in its players, and external issues that have diminished the popularity of the game.

Good grief. This year, there has been more buzz about Mad Men than about March Madness.

It took a while, but guards at Canada's Glenbow Museum finally noticed a new acquisition in the gallery: An oil painting of a semi-nude woman. An anonymous note said the donor's late father did the painting and had always wanted his work in a museum.

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DAVID GREENE, HOST:

Lawmakers in the House are expected to vote on a jobs act Tuesday. Part of the legislation would allow the public to make investments in start-up companies and small businesses. These companies could raise money online or through social networks. The bill would lift SEC regulations that restrict soliciting investors.