Same here, I learned differential equations for solving circuits and calculus in any number of variables or dimensions but it's all so foggy. I sometimes use Kh

Same here, I learned differential equations for solving circuits and calculus in any number of variables or dimensions but it's all so foggy. I sometimes use Khan Academy to connect the dots. So the memories are there, I just don't have a pin where they start from. I've also noticed as I've gotten older that more pins have fallen away, so it's like I have countless trees of knowledge in detached HEAD states that I can't access until I read up on something and revive the pins. I think that the real problem with textbook education is that it doesn't distinguish or prioritize the parts that trip us up. Which is really bad for divergent thinkers (like with ADHD) who remember things as a series of understood concepts where each builds on the last, rather than through rote memorization. I wish there was a better way of organizing textbooks more like a wiki, where the obvious parts (assumed to be known) would be in the footnotes, and the pins would make up the main body of the text. It would amount to the questions that students ask during lectures. That way whole semesters could be compressed down to perhaps 2 weeks of learning. Is that Cliffs Notes? Writing this out, I just realized that I never used them! Maybe there's something better today? Edit: maybe orphaned branch is a better term, but you get the idea! So I need tags for those branches or they're lost forever on the tip of the tongue.