Over the years, a lot of information has visited itself upon me. Materials Science and Engineering, various topics in nuclear engineering, nuclear physics and nuclear chemistry, tons of things involving computers, athletic first aid, cooking, weight lifting, the global positioning system, statistics, mathematics, physics, chemistry are most of the topic areas I know a lot in.
So, if there is a topic of interest there for you, I think teaching or tutoring might be arranged. I have had a little formal experience at teaching, having a few days of substitute teaching at a high school in British Columbia, 1/4 of a graduate level course in the use of radioactive tracers (with labs), a couple of weekends teaching introductory Linux at a technical college, and almost 10 years of teaching weight lifting for a number of YMCAs in Edmonton.