When I was a freshman, I invented the electric motor! I think it's something that just happens when you're getting acquainted with a subject, and understand it well- you get a sense of what the good questions are, and start asking them without being told.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.