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It is important to view knowledge as sort of a semantic tree -- make sure you understand the fundamental principles, ie the trunk and big branches, be...more

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You need to live in a dome initially, but over time you could terraform Mars to look like Earth and eventually walk around outside without anything on...more

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My proceeds from the PayPal acquisition were $180 million. I put $100 million in SpaceX, $70m in Tesla, and $10m in Solar City. I had to borrow money ...more

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Rockets are cool. There's no getting around that.