The professore could chat about quite a number of open questions/events:
the tikzlings visit to france.
tikzlings quantum physics: is the dead \cat[schroedinger] entangled with a laughing or a crying mouse?
why is tikzducks a separate package (https://github.com/samcarter/tikzlings/issues/8)
What does a Professore from Brazil and now living in Milan think ...
A useful area centered on tex.sx could be strategies for finding previous questions on the same topic.
There's a posting on tex.meta entitled "Often referenced questions": https://tex.meta.stackexchange.com/q/2419. This is cumulative (I add to it whenever I find a particularly good question/answer in an area that isn't already covered, and encourage ...