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  • Dan at Predictably Irrational further discusses the results of his FREE! experiment.  Basically, the simple fact that something is made available free creates a preference for that good even when the relative difference in price between that good and a presumably better one stays constant.  However Dan recounts the results of some different variations on the experiment and notes that the change in demand was not constant
  • USA Today has launched a Presidential approval ratings tracker.  The tracker provides data from the Gallup Presidential Approval poll starting with Truman in the 1940′s.  You can view the previous 12 presidents in chronological order, isolate specific presidents, or compare them.  The tool provides the exact dates from the polls and the breakdown of approve, disapprove, and no opinion.  Via FlowingData.com.
  • Crowdsourcing answers to the toughest problems in mathematics.
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