While teaching large physics lectures at MIT, Walter H. G. Lewin radiates enthusiasm. "And now, I’m going to blow your mind," said Lewin before giving a lesson about electrical circuits that seem to defy logic. "I’m going to make you see something that you won’t believe, so try to follow step by step." Yesterday, Sara Rimer of the New York Times profiled Lewin. She explained that the energetic 71-
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