professor daniel’s Answer
Students don't any of us remember anything we learned from previous years, due to the
METHOD of teaching. Words (lecture) without experiential involvement teaching is a Lose-Lose interaction. You hear it once and maybe make a note, and never practice the new knowledge.
Long term retention of this method is negligible.
It is comparable to giving a 5 year old only a Powerpoint presentation on learning to ride a bike. :-)