Hobbies

Prediction — I have a list of public predictions and my track record at PredictionBook. This hobby is on hold as I finish my PhD.
In the past I ran a website about homemade water guns, and I've been featured in the New York Times for my work in that hobby. At the moment I'm planning on revamping this website to have some better designs and also make it more of an educational resource on fluid dynamics.

Old hobbies

Pneumatic guns — I'm interested in the ballistics of pneumatic guns like spud guns. I have a (very) rough collection of notes about the ballistics of pneumatic guns (pdf). In the past, I also developed simulators for pneumatic guns. The old simulator BAGS is now on GitHub. (Note that I am not the owner of the linked repository.) At present I have no intention of improving this simulator in the future.