When I regularly taught university # physics , I would save time at the end of each semester for "special topics". Students would suggest ideas about 1 month before end of term. A few weeks later they would rank-vote the ideas. The top 1-2 would then be turned into special topics lectures. I made these available for public viewing; for the # fediverse I have a # peertube instance where these live now. Example: "Light and the Dark Cosmos": https:// media.cooleysekula.net/w/hNGNo hpLB7c62JUz8w2E2H # fedibookfair