Assorted links

1. Do female members of Congress work harder than the men?

2. Via Craig Newmark, data on the Duke economics Ph.d. students.

3. "The goal is free."

4. Centralized institutions and sudden change, a new paper.

5. A new Peter Chang sighting.

6. The Economist reviews TGS.  (I am pleased that TGS made the NYT bestseller list for eBooks last week at #14; thanks to all of you who bought it and recommended it!)