NPR reporter David Kestenbaum tells host Ira Glass about the time, when he was doing graduate work in physics, he and his other single friends decided to figure out the mathematical probability that they'd find girlfriends. They wanted to know what the chances were that there was more than one person in the world for them.
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Alex Blumberg and NPR correspondent (and "Planet Money" reporter) Dave Kestenbaum examine what went wrong with the credit ratings agencies. When all these financial instruments that brought down our economy—the mortgage backed securities, the derivatives—were originally issued, the rating agencies (Standard and Poors, Moody's and Fitch) gave many of these things their top rating of triple-A.