Now that I've been through being a kid, growing up, and then having kids, it's clear that the main thing that differentiates people is simply whether they make an effort. Whether they're content to drift along with the current, or whether they try to swim.

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When you're deciding what to study in college, don't try to predict what will be valuable in the future, because that's so hard that you'll probably get it wrong. Instead focus on what you personally find most exciting. You can't get that wrong.

When I talk to more established startups, one of the first things I want to know, after asking about the growth rate and whether they're profitable, is whether the founders still have board control. I'm more optimistic about the company when the answer is yes.