Interesting domains

Well, they're all interesting, but honestly - investment seems rife with possibility. After all, it has a large and eclectic set of concepts that are hard to keep track of, it uses mathematical tools that are interesting in and of themselves, the coding of models is an ongoing process at all times, it can easily involve the integration of external data in arbitrary formats - it basically has everything you'd want in a coding domain, plus the added cachet of being respectable, reputably arcane, and possibly even lucrative.

But a safer and smaller domain (sort of a Hofstadterian microworld) might simply be data mining from online resources.