THERE may not be a person in America without a strong opinion about what coulda, shoulda been done to prevent the underwear bomber from boarding that Christmas flight to Detroit. In the years since 9/11, we've all become counterterrorists. But in the 16 months since that other calamity in downtown New York -- the crash precipitated by the 9/15 failure of Lehman Brothers -- most of us are still ignorant about what Warren Buffett called the "financial weapons of mass destruction" that wrecked our economy. Fluent as we are in Al Qaeda and body scanners, when it comes to synthetic C.D.O.'s and credit-default swaps, not so much.
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