Justin Wolfers
@JustinWolfers
加入 July 2011
1.5K 正在关注 452.1K 粉丝
It finally happened. That moment in an absent-minded professor's life when I walked into a packed classroom of hundreds of students, and started teaching the wrong lecture. They had all done the reading, so must have known. No-one interrupted me, until a few minutes in.
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