Talk of the Nation on WAMC HD2

Reporting in the journal Nature Communications,researchers write that they were able to track down the cells causing clogged arteries. Dr. Jill Helms, co-author on the study, discusses why stem cells are to blame and how the study could lead to more effective treatments.

Russian antivirus firm Kaspersky Lab has discovered a piece of malware infecting computers mostly in the Middle East. Flame eavesdrops on conversations, takes screenshots and steals data from infected computers without being detected. Wired's Kim Zetter discusses how the malicious code works.

Alan Alda challenged scientists to explain what a flame is to an 11-year-old. Three months and more than 800 entries later he is back with the winner of the contest. Ira Flatow and guests discuss the winning entry and why the contest was an effective exercise in science communication.

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NEAL CONAN, HOST:

This is TALK OF THE NATION. I'm Neal Conan in Washington. Massachusetts Democratic Senate candidate Elizabeth Warren continues to face criticism over undocumented claims she made that for several years she was Native American. Warren acknowledged that she told officials at Harvard and the University of Pennsylvania that she was of Cherokee and Delaware Indian heritage, but she insists that played no role in her hiring.

Union shops in the private sector have dwindled in recent decades. Now, public union leaders across the country worry that they're losing political clout, bargaining power and members. That raises questions about whether unions fallen victim to their own success, and who needs unions.

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NEAL CONAN, HOST:

Eleven times over the past 34 years, a three-year-old thoroughbred arrived at Belmont Park with a chance to win the Triple Crown, and 11 times, he failed. A sport in sore need of a superstar hopes that I'll Have Another breaks that jinx on Saturday. The winner of the Kentucky Derby and the Preakness is listed as the odds-on favorite to win the Belmont Stakes. But racing writer Andy Beyer argues that the crowded schedule, the unusual distance and history all suggest you should put your money on another colt.

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Wisconsin Governor Scott Walker survived his recall election, a victory that may signal trouble for Democrats at the national level come November. NPR's Political Junkie columnist Ken Rudin and Katrina Vanden Heuvel of The Nation talk about what Walker's victory means for progressives.

Richard Grenell recently explained that Mitt Romney chose him to serve as his foreign policy adviser based on his record and abilities. The Romney campaign, he says, also knew he was openly gay. Grenell explains why he resigned, and where Romney and President Obama differ on foreign policy.