Usually I'm excited about something at first and then it dies down over time. Very rarely it goes the other way. I think you can get better at predicting what

Usually I'm excited about something at first and then it dies down over time. Very rarely it goes the other way. I think you can get better at predicting what you will and won't like over time. You learn what you do and don't like about different types of projects. One obvious trick for startups it to solve a problem you have yourself that you truly and deeply want fixed. When Zuck started Facebook he wasn't deeply passionate about "making the world a more open and connected place" neither was Larry Page about "organizing the world's information". Their passion grew into a grand vision out of a small kernel of interest. It's hard to predict in advance how big an idea can grow.