Agreed. I've known my co-founder for ten years! In "A Student's Guide to Startups," pg writes: Most of the questions people ask Y Combinator we have some kind

Agreed. I've known my co-founder for ten years! In "A Student's Guide to Startups," pg writes: Most of the questions people ask Y Combinator we have some kind of answer for, but not the co-founder question. There is no good answer. Co-founders really should be people you already know. And by far the best place to meet them is school. You have a large sample of smart people; you get to compare how they all perform on identical tasks; and everyone's life is pretty fluid. A lot of startups grow out of schools for this reason. Google, Yahoo, and Microsoft, among others, were all founded by people who met in school. (In Microsoft's case, it was high school.)