Decisions without blinders.

By the time Merck withdrew its pain relief drug Vioxx from the market in 2004, more than 100 million prescriptions had been filled in the United States alone. Yet researchers now estimate that Vioxx may have been associated with as many as 25,000 heart attacks and strokes. Evidence of the drug's risks was available as early as 2000, so why did so many doctors keep prescribing it? The answer, say the authors, involves the phenomenon of bounded...