I watch videos and read wikipedia to try to keep those things fresh in my mind. Do I still remember the Greek alphabet? What's the formula for (k choose n)? Wha

I watch videos and read wikipedia to try to keep those things fresh in my mind. Do I still remember the Greek alphabet? What's the formula for (k choose n)? What's the difference between permutation and combination? Can I still write a Turing machine? What about a Turing with multiple tapes? I have a bunch of those "questions" that I try to always remember. My YouTube history is a bunch of those types of videos with some best moments clips from my favorite comedy shows in between them.