Great question. I'm excited to see the other responses.

I'm a visiting scientist at a nuclear physics institute, but my degree was in mechanical engineering. Currently working on creating highly charged isotopes to be used for cancer research.

Last year I built a single seat off-roading buggy with some friends, which was a really rewarding, and fun project.

Current side project is learning to work with some RPI's to make a mesh network that I could use for my sound system. Also, since we can't be on computers all of the time, learning to play guitar and training for a triathlon.