Talk of the Nation on AM 870 NewsTalk

Astrophysicist Adam Riess shared the Nobel Prize in Physics in 2011 for his work on distant supernovae, which demonstrated that the universe was not only expanding--but that its expansion was accelerating. Now he's hunting for clues that might explain why, and one of the prime suspects is a mysterious force known as dark energy.

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NEAL CONAN, HOST:

This is TALK OF THE NATION. I'm Neal Conan, in Washington. More good unemployment numbers today, oil prices tick down, positive news even about the housing market. Yes, many millions are still out of work, banks continue to process foreclosures, overall economic growth remains sluggish. But right now anyway, some sectors are doing better, a few are actually booming.

Gov. Rod Blagojevich is serving a 14-year prison sentence in a Colorado prison. Former Missouri state senator Jeff Smith served a year in federal prison on obstruction of justice charges. He offers sober advice to Blagojevich on what to expect, and what and what not to do behind bars.

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NEAL CONAN, HOST:

This is TALK OF THE NATION. I'm Neal Conan in Washington. Israelis see Syria convulsed in violence to their north; uncertain relations with a much-changed Egypt to the south; and many fear a conflict with Iran could be just a matter of time. But as if to remind us of the central dispute in the region, Palestinians launched a barrage of rockets from Gaza last week. Israel responded with airstrikes. [POST-BROADCAST CORRECTION: The violence began when Israel assassinated a leader of a militant Palestinian faction in Gaza.]

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NEAL CONAN, HOST:

The Iranian government continues to deny U.N. nuclear inspectors access to a military base where some believe they tested atom bomb parts. But Iran also says it's willing to resume talks with the United States and five other big powers, though skeptics argue Tehran is just playing for time. At a news conference yesterday, President Obama stressed diplomacy but added time for talks is running out.

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NEAL CONAN, HOST:

This is TALK OF THE NATION. I'm Neal Conan in Washington. Last October, Terry Thompson released 50 exotic animals on his farm in Ohio and then shot himself in the head. Neighbors soon reported lions, tigers, bears, leopards, monkeys and wolves on the loose, and sheriff's deputies from the city of Zanesville nearby hunted them down in the gathering darkness.

President Bashar Assad and his opposition continue to crack down on rebels in Syria. U.N. envoy Kofi Annan met with Assad to try to broker a cease fire, but failed. The U.N. Security Council is drafting another resolution to support the Arab League request to have Assad step down from power.

Rick Santorum swept the Mississippi and Alabama primaries on Tuesday, leaving Mitt Romney a distant third. Newt Gingrich maintains he'll carry on, and third-place finisher Mitt Romney faces renewed doubts about his ability to win over conservative Republicans, though he's leading the delegate race.

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JENNIFER LUDDEN, HOST:

This is TALK OF THE NATION. I'm Jennifer Ludden in Washington; Neal Conan is away. We still don't know why a U.S. Army soldier allegedly murdered 16 men, women and children in Afghanistan. That investigation continues. The consequences, though, seem clear.

The families involved are devastated. The Taliban promises revenge. The Afghan Parliament issued a statement saying Afghans had run out of patience with foreign soldiers, and the New York Times reports that the Obama administration is debating a speedier pullout from the country.

An advertising agency sparked controversy at the South by Southwest technology conference when it hired homeless people in Austin to act as "Homeless Hotspots." Critics charge that it exploits the homeless. But Megan Garber, a staff writer for The Atlantic, sees some good in the project.

NPR's Jennifer Ludden reads from listener comments on previous show topics including the controversy over mapping Muslims, the jump in grey divorces, reaction to the viral video Kony 2012, and leaving the Catholic Church.

Comedians Keegan-Michael Key and Jordan Peele push stereotypes to new — and sometimes uncomfortable — levels in their jokes.

On stage, on MadTV and now in their Comedy Central show, Key & Peele, they find the humor in their biracial upbringings and the many roles of black men in America.

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JENNIFER LUDDEN, HOST:

This is TALK OF THE NATION. I'm Jennifer Ludden, in Washington. Neal Conan is away. Losing a loved one is, simply put, painful. Such separation brings extreme sadness that can feel sometimes too heavy to bear. The Irish writer C.S. Lewis chronicled his suffering and healing after his wife died of cancer at the age of 45.

In Afghanistan and other conflict zones, the military is often first on the ground, followed by diplomats, contractors and journalists. Next, in many cases, are aid workers: People who work for private organizations and strive to remain impartial in some of the world's most dangerous places.

The NFL found some two dozen players for the New Orleans Saints took part in a pay-for-hits program that paid bounties for knocking specific players out of games. Those involved likely face fines or suspensions. But lawyer Eldon Ham argues that doesn't go far enough, and proposes criminal charges.

A Department of Education study found from 2009 to 2010, black students were 3 1/2 times more likely to be suspended or expelled than white ones. Though the reasons are unclear, many argue harsher punishments push many black and Latino students out of schools and into the criminal justice system.

Chances are, you've fallen victim to earworms — pesky songs or melodies that get stuck in your head and just won't get out.

Research suggests that there are psychological reasons why some songs are more likely to stick, including memory triggers, emotional states, and even stress. Some researchers hope to better understand why this happens and figure out what, if anything, music memory can teach psychologists about how to treat patients dealing with memory loss.

The New Horizons Mission blasted off toward Pluto in 2006; it's on course to arrive in Pluto's neighborhood in 2015. Mission leader Alan Stern discusses the journey of the spacecraft, and why he thinks Pluto is still a planet. Plus, the mission to get Pluto on a commemorative stamp.

Reporting in Nature, researchers write they have deciphered the genetic code of the gorilla, the last of the great apes to have its genome sequenced. Study co-author Aylwyn Scally discusses what the data reveal about the evolution of humans and other apes.