[Rezzing since it saves me the trouble of typing out a title and intro for a new topic]
Inspiring post by Exapno_Mapcase. He intimated that having 10 such areas would be exceptional.
Feel free to use the 99.9% threshold tho that isn’t a hard and fast rule. If you wish, you can put in your own % for each area. Your professional skills would presumably be your starting point.
Me:
Zoology specifically, biology generally (definitely more of a macro than micro type tho)
Mathematics, thru pre-algebra
Teaching skills
English grammar and writing skills (my sister recently expressed amazement at same, even tho they were just legal emails)
Reading comprehension in general
Auto racing, both history and how-to, tho I’ve never actually taken the wheel except for one track day in my own car.
WW2 history
Astronomy tho not at a pro level