I think we’ve all had those moments where we come across something interesting, look into it a little, and somehow end up three hours later learning about something completely different. 
It doesn’t have to be work-related, either. Maybe it was a historical event, something about science, an unusual medical case, or a random question you decided you needed an answer to.
I’m curious what subjects have sent other people down a rabbit hole. Did you actually find the answer you were looking for, or did you end up with even more questions?
Feel free to share what you discovered, too. I love learning about things I wouldn’t have thought to look up myself.