I agree that interest level plays a lot into how much we remember when stoned. I believe that I retain everything I've learned, it's just a matter of accessing those memories. So I work at it. I naturally have a head for trivia, jazz and blues history, growing cannabis, all things of high interest to me. I can tell you every member of the 1938 Count Basie Band or the starting line up of the 1960 Pittsburgh Pirates. When I run across something I don't remember immediately I keep working at it. It might take a week or two, but eventually I will remember. Sometimes it's just a matter of something unrelated triggering that memory. It drives my wife nuts. I'll be like "remember that conversation we were having last week and you asked me . . ., well here's the answer. LOL, most of the time she doesn't even remember the conversation, let alone what we were trying to remember. While I do keep notes and a lot of links to useful growing information and reference material, most of the information I dispense here is all from memory.