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In two separate experiments, scientists have repaired injured rodent hearts by transplanting into them stem cells, cells that are capable of developing into many cell types. The stem cells stimulated the development of new blood vessels and muscle tissue in the hearts of mice and rats. While more research needs to be done before the procedure can be tried in humans, NPR's Richard Harris reports that scientists hope that it will someday help people who've had heart attacks.

Rathcroghan was the center of an ancient society in present-day Ireland.

It costs a lot of money to rent a tuxedo for the prom. So Aaron Theisen has decided not to wear one. It's not that he can't swing the cost. He thinks the money can be better used. Theisen is donating the amount he'd otherwise spend on a tux to the Cystic Fibrosis foundation. And he's convinced some other kids to follow. Noah Adams talks with Aaron Theisen, a high school senior at Marquette University High School in Milwaukee, Wisconsin.

NPR's Debbie Elliott reports on the defense of former Ku Klux Klansman Thomas Blanton Jr. in the Birmingham, Alabama church bombing trial. Blanton is charged with murder in the 1963 bombing of the Sixteenth Street Baptist Church. Fours girls died in the blast. The defense says prosecutors have produced nothing that directly links Blanton to the crime.

NPR's Guy Raz reports from Berlin on a controversial exhibit that is drawing huge crowds. The artist -- German anatomy professor Gunther Von Hagens -- mummifies human and animal organs and bodies by immersing them in a polymer solution. He then poses and displays the bodies. Von Hagens says his exhibit is intended to "enlighten" the public, and indeed many visitors see it as educational. The Roman Catholic Church, however, sees it as a perversion.

NPR's Tom Goldman reports on a re-creation of the original game of baseball. The Genesee Country Village and Museum, near Rochester, New York, spent about $200,000 to build an authentic wooden baseball stadium.

NPR's Gerry Hadden reports thousands of Mexican guest workers who worked in the United States during World War II say they have never received the money that was set aside for their retirement. With interest, the retirement fund would be considerably bigger today. Class action suits and a new commission in Mexico are trying to find out what happened to the money.

Commentator Patrick Maney says the fascination with the first 100 days of the American presidential term started with the successes of President Franklin Roosevelt.

After nearly three years of war in Congo, an American aid agency says the conflict has cost close to 3 million lives. Robert Siegel talks with Dr. Les Roberts, an epidemiologist and the director of Health Policy for the International Rescue Committee in Martinsburg, West Virginia.

NPR's Vicky O'Hara reports a team of American engineers is on its way to the island of Hainan where they will inspect the U.S. surveillance plane that was forced to land there after a midair collision with a Chinese jet fighter on April 1. The team will evaluate how best to move the plane and bring it back to the United States. U.S.-China cooperation on this matter is seen as a positive development in the often troubled relationship.