One place to find hard open problems is at the end of technical papers (e.g. in math, science or engineering). Many of them will have a section talking about is

One place to find hard open problems is at the end of technical papers (e.g. in math, science or engineering). Many of them will have a section talking about issues, future work, ideas remaining to explore, etc. There are infinitely many hard problems out there. If you want to stay motivated, work on stuff that matters. http://radar.oreilly.com/2009/01/work-on-stuff-that-matters-fir.html http://radar.oreilly.com/2009/01/work-on-stuff-that-matters-...