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On-Air Challenge: In honor of Mother's Day, come up with items in each of the given categories that start with the letters of the word "Madre." For example, for the category "3-letter boys' names," the answer would include Moe, Art, Don, Ray and Eli.

Last Week's Challenge: From listener Dave Taub of Eugene, Ore.: Take the name of a well-known U.S. university. One of the letters in it is a chemical symbol. Change this to a two-letter chemical symbol to name another well-known U.S. university. What universities are these?

The Pentagon has released clips from five videos confiscated from Osama bin Laden's compound in suburban Pakistan.

The video snippets show bin Laden watching coverage of himself on television and rehearsing for terrorist propaganda videos. Taken together, they provide revealing images of what his life may have been like while he was in hiding.

Officials say it is unclear if the videos were actually filmed at his house in Abbottabad, Pakistan, where U.S. Navy Seals killed him earlier this week.

Sebastian Rotella Copyright 2011 National Public Radio. To see more, visit http://www.npr.org/.

NPR has been profiling some of the Republicans who are considering a presidential run in 2012, to find out what first sparked their interest in politics. Read more of those profiles.

In 1994, President Clinton was crisscrossing the country to sell his health care reform plan. Among the skeptics were small businesses.

Herman Cain was living in Omaha, Neb., then, and was the CEO of Godfather's Pizza. At a town hall meeting, he stepped forward to question the president.

When I covered the siege of Sarajevo, I heard stories about a slim, tall renegade Saudi prince who reportedly went there a couple of time bearing sacks of money.

"Our Muslim brothers are being killed, our women raped, our children massacred, all under the eye of the United Nations," the prince was said to have declared. "The West sends Blue Helmets and dried beans. We bring you guns and men."

It wasn't until later in the 1990's that I learned he was Osama bin Laden.