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Some people don't like change, but you need to embrace change if the alternative is disaster.

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If something's important enough, you should try. Even if you - the probable outcome is failure.

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We could definitely make a flying car - but that's not the hard part. The hard part is, how do you make a flying car that's super safe and quiet? Beca...more

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When something is important enough, you do it even if the odds are not in your favor.

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It's OK to have your eggs in one basket as long as you control what happens to that basket.

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In order to have your voice be heard in Washington, you have to make some little contribution.

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I do love email. Wherever possible I try to communicate asynchronously. I'm really good at email.

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You need to be in the position where it is the cost of the fuel that actually matters and not the cost of building the rocket in the first place.

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My vision is for a fully reusable rocket transport system between Earth and Mars that is able to re-fuel on Mars - this is very important - so you don...more

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There's a silly notion that failure's not an option at NASA. Failure is an option here. If things are not failing, you are not innovating enough.

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If you want to grow a giant redwood, you need to make sure the seeds are ok, nurture the sapling, and work out what might potentially stop it from gro...more

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If you look at our current technology level, something strange has to happen to civilisations, and I mean strange in a bad way. And it could be that t...more

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If you think back to the beginning of cell phones, laptops or really any new technology, it's always expensive.

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I would like to fly in space. Absolutely. That would be cool. I used to just do personally risky things, but now I've got kids and responsibilities, s...more

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I think you should always bear in mind that entropy is not on your side.