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Have you ever wondered what would happen if Louis Pasteur joined The Clancy Brothers? Or if The Chieftains were more nerdy and less talented? Well, wonder no longer!

I wrote this song about the science of beer last year and the folks at The Salt asked me to dust it off in celebration of St. Patrick's Day.

In a vaguely Irish style, the song salutes that hero of beer production, the yeast Saccharomyces cerevisiae, and explains the biochemistry of inebriation.

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MELISSA BLOCK, HOST:

We're going to follow the money now with our regular Friday political commentators, E.J. Dionne of The Washington Post and David Brooks of the New York Times. Welcome back to you both.

DAVID BROOKS: Good to be here.

E.J. DIONNE: Good to be with you.

BLOCK: And I want to start with a hypothetical question. What would this primary contest, do you think, have looked like without superPACs and without the Supreme Court's Citizens United decision? David Brooks, a very different race?

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MELISSA BLOCK, HOST:

The public radio show THIS AMERICAN LIFE has retracted a lengthy story it ran in January. The report painted an ugly picture of working conditions at Chinese factories where they manufacture iPhones and iPads. The story focused on a monologue told by performer and activist Mike Daisey about his interviews with factory workers. NPR's media correspondent David Folkenflik joins me now. And, David, this was THIS AMERICAN LIFE's most popular podcast. How are they explaining their decision to retract the story?

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MELISSA BLOCK, HOST:

The U.S. Supreme Court has announced that it will make available same-day audio of upcoming oral arguments later this month, arguments that could determine the fate of the Obama health care overhaul.