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Our lives are pretty calm. Merging on the freeway in the closest you get to risking your life. So what's missing now is that primal emotion of being scared to death, and I think that's why people crave thrills like roller coasters or scary movies. They give you the chance to feel this very primal emotion in a very controlled environment.

I'll tell you, being involved in human space flight, it is an emotional endeavor. I think it brings in the highest highs and the lowest lows.

It is the greatest shot of adrenaline to be doing what you have wanted to do so badly. You almost feel like you could fly without the plane.

There is no worse emotion than fear.

The thought that all experience will be lost at the moment of my death makes me feel pain and fear... What a waste, decades spent building up experience, only to throw it all away... We remedy this sadness by working. For example, by writing, painting, or building cities.

Death makes us sad, but it can also make us feel more alive.

Death by plane crash scares me. I travel a lot, and when you hit turbulence, and post 9/11, that's in the back of my mind a bit.

Fear is one of the worst, and most limiting, emotions in life.