I definitely have to sketch out the tough things at least. There was a study I read about years ago that showed pen and paper were far superior to typing out notes. Something about the act of writing meant you were far more likely to retain the information even if you never go back and re-read the notes. I don't know if it's true, I don't know if it's even true for me, but whenever I'm feeling superstitious I make sure I write it down on paper.
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