We live in amazing times. Digital media and the Internet have transformed how we exchange ideas, how we learn, how we think about ourselves, and even how we think at all. When I was an undergraduate in the late 1980s, the traditional ways of learning were through lectures, seminars, books, writing essays, talking about ideas with friends. Learning tended to be local: you needed to be in the same space with the people from whom you were learning, and in the room with the books and journals that c...
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