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During an In Performance at the White House concert featuring B.B. King, Buddy Guy, Mick Jagger, Jeff Beck and other blues greats, the president sang along briefly. Catch the video.

Mitt Romney has cut deeply into the substantial lead Rick Santorum held earlier this month. Romney's campaign and superPAC are flooding the airwaves with attacks on Rick Santorum.

Also: More protests in Afghanistan over burning of Qurans; Greek lawmakers rush to enact austerity measures; GOP presidential candidates gather for another debate.

The Syrian government's crackdown against dissenters continues, and Western journalists were killed on Wednesday as forces shelled the city of Homs. Meanwhile in Libya, reports of torture are surfacing, and the interim government is struggling to control armed militias. Host Michel Martin talks with Al-Jazeera Washington Bureau Chief Abderrahim Foukara.

Women are more likely to have heart attacks that don't announce themselves with crushing chest pain. And women having heart attacks like those are more likely to die than men.

Advertisers collect information with every digital move people make. They then target ads based on that information. Communications scholar Joseph Turow worries that advertisers will use such data to discriminate against people and put them into "reputation silos."

Red-light and speed cameras are now used in 24 states. But angry drivers are fighting back with lawsuits, vandalism and a raft of ballot initiatives.

The U.S. has used military force to help oust three dictatorial regimes since 2001. But other autocrats have good relations with the U.S., and some even get the red-carpet treatment. What factors account for the different responses around the world?

The group plans to draft and ratify a set of grievances, which will then be presented to the U.S. government. The group warns if politicians don't act, they will reconvene to run a set of candidates who pledge to redress those grievances.

A museum first proposed in 1915 by black veterans from the Civil War is finally under construction on the National Mall in Washington. The Smithsonian's National Museum of African American History and Culture is scheduled to open in 2015.