Alameda county chief probation officer David Muhammad has been accused of sexual assault. Some are saying this may delay Governor Jerry Brown’s plans to shut down our state youth prison system…

Also delayed is the San Bruno lawsuit against PG&E for the 2010 explosion that devastated 108 homes…

The United States and five other nations are embarking on a new program to limit pollutants connected to global warming. But they're not targeting carbon dioxide with this effort — instead, they're looking at methane gas, and soot.

NPR's Richard Harris filed this report for our Newscast desk:

"Secretary of State Hillary Clinton says the U.S. is teaming up with Canada, Mexico, Sweden, Ghana and Bangladesh to get countries thinking about some potent contributors to climate change."

With Twitter and other social media, NPR's Andy Carvin monitored immediate, on-the-ground developments during the upheavals of the Arab Spring from Washington, D.C., through thousands of tweets and an army of followers that numbers in the tens of thousands. Now, he is in Libya, meeting face-to-face with some of those activists. He'll be sending us periodic updates on his journey.

International pressure is building on Iran. On Wednesday, Iranian leaders claimed they made strides in their nuclear program and threatened to stop supplying oil to six European countries. Host Michel Martin hears what people inside the country think about the tensions. She speaks with writer Hooman Majd and human rights activist Sussan Tahmasebi.

A closed-door summit on controversial bird flu research starts today, and the newly released guest list reveals that the event will be dominated by virologists.

Stephen Sondheim's 1981 musical Merrily We Roll Along is in the middle of a two-week run at the New York City Center as part of an Encores! Production. Portions of the interview running today were originally broadcast on April 21, 2010 and Oct. 28, 2010.

Rick Santorum released four years' worth of tax returns Wednesday evening which showed that he is wealthy by any measure.

But his returns may also allow his critics, both those aligned with Mitt Romney, his chief rival for the Republican presidential nomination and those who aren't, to attack the former U.S. senator from Pennsylvania for not giving as much to charity as many others at his income level.

The world of international relations seems to have focused on Pakistan today: The president of Iran and the president of Afghanistan both made their way to the country just as tensions between Iran and Israel made the news and just as reports emerged that the U.S. and the Taliban were beginning secret talks.

The official agenda of the meetings is to discuss counter-terrorism and transnational organized crimes at a regional conference tomorrow in Islamabad.

The meteoric rise of New York Knicks point guard Jeremy Lin has echoes of Tim Tebow, the Denver Broncos quarterback who caused such a stir last fall.