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The Importance of Preparation for Launch
I think everybody should be afraid of heights. Having a basic respect for heights is healthy. But don't just be a shivering chihuahua all the time, because you can't figure out the difference between actual danger and just perceived danger. The vehicle is still very unknown and the most complicated flight machine ever built. We only flew it 135 times. Any time you've ever got on an airliner, it's flown countless times before they ever take paid passengers on board. And yet we flew the shuttle on operational missions right from the beginning.