Remind me, in the history of the physical sciences, how many "groundbreaking breakthroughs," came from academics teaching undergraduates? My mind is genuinely

Remind me, in the history of the physical sciences, how many "groundbreaking breakthroughs," came from academics teaching undergraduates? My mind is genuinely struggling... Certainly not Curie, Einstein, Fleming worked in a hospital. Maybe the problem is... Undergraduates!