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christ, if a bunch of mit brainiacs are so gobsmacked that they have to record a video because they don't how he does that, i seriously question who they let in.
I watched one of his classical mechanics lectures on YouTube. looks like someone took the time to edit a video. he did the dot think twice in 40 minutes. I remember when I first saw that..in a middle school math class. it all has to do with where, how tightly you hold, the angle you hold it at, and the direction you intend to make your line.