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What Kind Of Puzzles Did Larry Summers Solve At D.e. Shaw?

Slate's Chris Beam did some follow-up reporting with a former trader at D.E. Shaw, the hedge fund that employed Larry Summers between 2006 and 2008. (Recall that, according to the Times, Summers had to solve some "math puzzles" before D.E. Shaw would hire him.)

--Noam Scheiber