Feds rooting out 'unwelcome speech' on campus: But what is that?

'Obamagate' danger for the GOP: political overreach

9:10 am ET - Republicans are jumping all over what they see as major scandals in the Obama administration, including Benghazi, the IRS, and checking journalists’ phone records. But some in the GOP are warning against the perception of overreach for partisan purposes.

Hearing on IRS: What ousted chief offers, Republicans don't buy

6:40 pm ET - Steven Miller, who resigned as acting IRS head this week, argued that the extra scrutiny for conservative groups amounted to ‘foolish mistakes.’ House Republicans see some problems reaching the White House.

• Decoder Wire Why furor over IRS tea-party scandal won't subside, despite ouster

Why do planets farthest from sun have highest winds? Team closes in on answer

7:55 pm ET - The planets beyond Mars exhibit the highest winds speeds of any other planets in the solar system. It's a puzzle, because less energy from the sun is available there to drive higher winds. 

No more drug war in Latin America? Report explores new ways to fight drugs

4:10 pm ET - A new OAS report looks at alternatives to prohibiting the drug trade, including legal market regulation, reform of the UN drug convention, and smarter policing.

USA Update Texas tornadoes: The missing are found, more storms possible

4:56 pm ET - People missing after 16 tornadoes tore through north Texas on Wednesday have all been found alive, authorities report. As officials and residents assess the damage, they are keeping a wary eye on the weekend forecast.

Why Afghanistan is nervous about the US troop withdrawal

11:54 am ET - By December 2014 the Afghan National Security Forces that have been built by the US and NATO will be left to largely stand on their own.

New Orleans parade shooting: Arrests show city's reworked approach to policing

2:19 pm ET - The arrests of two brothers after a Mother’s Day parade shooting appear to be an example of the dramatic shift in gang-war policing that New Orleans has made under Mayor Mitch Landrieu.

Venezuela's Maduro still waiting on Washington's recognition

4:02 pm ET - More than a month since Maduro was elected Venezuelan president by less than 2 percent of the vote, the US has not recognized his victory. A partial recount of the ballot is currently underway.

Why US Senate race in Massachusetts is Ed Markey's to lose

12:55 pm ET - Ed Markey is a Democrat with high name recognition running in a blue state, and polls show him leading the GOP's Gabriel Gomez. But another US Senate race, in 2010, showed that Massachusetts voters can mete out some surprises.

EU austerity hawks shrug off criticism of flawed academic paper

3:34 pm ET - Despite a new paper detailing flaws in the Rogoff-Reinhart study that has been used to argue in favor of austerity policies, Europe's austerity advocates are holding course.

Spain's controversial educational reform: Will the Green Tide wash it away?

3:17 pm ET - New government reforms aim to reduce Spain's dropout rate. But they are opposed by green-shirted protesters from the education sector, known as the Green Tide.

Japan's 'secret' trip to North Korea disrupts united stance against Pyongyang

11:18 am ET - Japan's visit to North Korea comes after broad regional agreement that Pyongyang should not be offered talks unless it displays a genuine commitment to denuclearization.