I can often be found lurking on various stackexchange sites, such as Mathoverflow, math.stackexchange.com, academia.stackexchange.com, matheducators.stackexchange.com, etc. Of these, I am most active on ac.se; here are some of my questions and answers that I'm proud of:

Occasionally, mostly before major deadlines and finals, I like to draw. I am a big fan of charcoal and pencil shading and generally pretty bad at coloring. I enjoy figure drawing. In general, I like making things. I enjoy crocheting, knitting, and tatting. Recently I've gotten into amigurumi. Many years ago I went through a phase of fanfiction-writing and poetry-writing; the interested reader can find these on the internet pretty easily.