Robert Frank: Today’s question was posed by my former student Karim Abdallah. “Why,” he asked, “does a light come on when you open the refrigerator but not when you open the freezer?” The cost-benefit ...
It's a common situation: you open the fridge, and the light doesn't come on. So you decide to save the day and just swap in a regular bulb from the junk drawer. But before you do, you should know that ...
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