"To fly in space is to see the reality of Earth, alone. The experience changed my life and my attitude toward life itself. I am one of the lucky ones."

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People tend to think astronauts have the courage of a superhero - or maybe the emotional range of a robot. But in order to stay calm in a high-stress, high-stakes situation, all you really need is knowledge. Sure, you might still feel a little nervous or stressed or hyper-alert. But what you won't feel is terrified.

— Chris Hadfield