Anti-aging is an extremely under-explored field.

Twitter is hard to evaluate. They have a lot of potential. It's a horribly mismanaged company — probably a lot of pot-smoking going on there. But it's such a solid franchise it may even work with all that.

I do think Tim Cook is doing a very good job, I think he has almost impossibly big shoes to fill with Steve Jobs' departure. And so, that's the context always someone has to put things in. But, I do think that for the most part that Apple is at a point where it's much more focused on scale than on doing new things.

I think somehow people should be encouraged to think about a very long time horizon and I think this is true for businesses, it's true for governments and it's true for people doing things in the non-profit sector.

The something of somewhere is mostly just the nothing of nowhere.

Of the six people who started PayPal, four had built bombs in high school.

A company does better the less it pays the CEO.