I don't think I can explain this one

Funniest thing I’ve seen in a while – If you get it, you get it.

For some reason it reminds me of an exchange in my freshman honors electricity & magnetism course. E&M involves tons of different formulas, and we spent most of the term learning how to apply them and where they come from. These are hard, and one of the best things about majoring in physics is that almost every exam was open-book, open-notes – the tests were about your ability to solve problems and understand the material, not about memorization. On the last class before the first midterm exam, there was a review of the material, and the floor was opened for questions.

Student: “Will we get a formula sheet on the exam?” (to aid with remembering all the formulas)

Professor Leonard Susskind: “No…” [pauses, strokes his beard] “…you are allowed to re-derive the formulas during the exam.”

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