the unexpected. when i did some lab work in a course to study how different chain lengths travel at different speeds, that is what we got (shorter ones are slower iirc, because they interact more with surroundings, or maybe that is just true for chemical chromatography stuff). That was very interesting, cause i did that one with my seniors batch just because i was interested, and when it was time for my batch covid happened. also my first (major) exposure to carcinogen (we used some dye which is banned in eu i think)