Yep. So I think the more general advice is also simpler: work on problems you find interesting. Sometimes the ones that seem small lead to big things (I got an

Yep. So I think the more general advice is also simpler: work on problems you find interesting. Sometimes the ones that seem small lead to big things (I got an IPO out of one such). Often - ouch! - the ones that initially seem like they will be Important turn out to be ho-hum. But regardless of ultimate Importance (however you choose to measure that), it is a RUSH every time you find an elegant solution. That's why even as an 'old guy' I still love developing so much... even a relatively modest app provides daily doses of interesting sub-problems to crack.