I miss studying maths. I was *so* bad at it, but it was so beautiful.

It's really sad because I would always understand eventually, but I had zero instincts. I was better at Analysis than pure Algebra, since you could always find a way to get where you wanted. Algebra is the 100m dash, there's only one way, and either you see it or you don't. 

Dunno why but Series were my favourites. Something tactile about telescoping infinite series into a single result. Super satisfying.