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Elon Musk
Founder and CEO, SPACEX

"Don't panic." It's from Hitchhiker's Guide to the Galaxy by Douglas Adams. You have to be wary of emotion clouding your decision-making process - and of making a decision that you'll later regret. You have to be as clearheaded as possible. Of course it's a fine line, because you don't want to be completely dispassionate. As for bad advice, my parents advised me to ignore bullies. That doesn't work. You have to punch them on the nose.

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Last updated April 30 2008: 4:31 PM ET