Oh, forgot. How about teaching that mass = amount of matter in something?
Personally, I learned that mass = something's "resistance toward going at the speed of light". Not sure if that's correct, but it seemed to make sense.
I am usually not very interested in people (reminds me too much about corruption), unless they can be viewed as a non human entity. For example, to consider the society as a system of some sort, and analyse that without referring too much about people
For example, finance does not interested me in the past (because money->corruption->bad->headache to think about) Until just last year, a professor managed to taught it by reducing it into just a bunch of abstract concepts (hence chunky non human entities) and then I start to get interested in it as a study of how something called money flows in a system
@BernardMeurer So the bottomline is: It is possible to make me interested in a subject as long you can make it so that it does not remind me of people (except psychology, which I am interested because of self protection)