It's important that we attempt to extend life beyond Earth now. It is the first time in the four billion-year history of Earth that it's been possible, and that window could be open for a long time - hopefully it is - or it could be open for a short time. We should err on the side of caution and do something now.

Entrepreneurship is like eating glass and walking on hot coals at the same time

The reason we should do a carbon tax is because it's the right thing to do. It's economics 101, elementary stuff.

Starting and growing a business is as much about the innovation, drive and determination of the people who do it as it is about the product they sell.

I think it's important to reason from first principles rather than by analogy. The normal way we conduct our lives is we reason by analogy. [With analogy] we are doing this because it's like something else that was done, or it is like what other people are doing. [With first principles] you boil things down to the most fundamental truths…and then reason up from there.

You should be innovating so fast that you're invalidating your prior patents.

Land on Mars, a round-trip ticket - half a million dollars. It can be done.