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Pennsylvania is among six states holding primary elections Tuesday. Gov. Tom Corbett is unchallenged in the GOP primary, but the general election is a different story.

A Mexican national was executed by the state of Texas on Wednesday night for killing a Houston police officer. He was put to death by lethal injection shortly after the U.S. Supreme Court rejected his appeal, and despite calls from Secretary of State John Kerry to delay the punishment.

Insurance enrollment will be a key yardstick for assessing whether the Affordable Care Act is working. Almost as important as the total number of people who get coverage is whether a significant percentage of them are healthy.

Tuberculosis is one of the oldest diseases in human history. Signs of the bacteria have even been seen in Egyptian mummies. Now scientists find evidence that TB is much more ancient than we thought. The bacteria may have started infecting people more than 70,000 years ago, long before farming began.

Ai Weiwei, the world-renowned Chinese artist and dissident, has created a deeply autobiographical work for the Venice Biennale exhibit. It is a series of dioramas about his life as a political prisoner, when he was jailed for criticizing the corruption and shoddy construction that caused the deaths of 5,000 children when schools collapsed in the 2008 Sichuan earthquake.

One bombing suspect is dead and the other in custody after a week of investigation that led to a tense manhunt and standoff Friday. NPR's David Schaper joins Weekend Edition Saturday host Scott Simon with the latest on the Boston Marathon bombings aftermath.

The 2012 election was the most expensive in history, but there remain some gaping holes in our knowledge about who paid for what. The Securities and Exchange Commission is considering a proposal to add more transparency in future elections, but it won't happen without a fight.

President Obama's nominee to run the CIA has his confirmation hearing Thursday afternoon. The hearing of White House counterterrorism chief John Brennan comes as lawmakers are studying a memo on drone strikes overseas. Robert Siegel talks to Tom Gjelten.

James is averaging more than 40 points a game, and with him leading the way, his team isn't looking like the underdog these days. But observers wonder what's fueling his on-court rampage.

A New Jersey high school teacher used the rapper's latest album to teach a unit on Toni Morrison's novel, The Bluest Eye. Lamar found out about it, and decided to stop in for a visit.