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How exhilarating is it, really? >> it's very exhilarating. the movie "gravity" is a good movie, but you don't want to watch it while you are in space. >> good point. >> it's really a great experience for the astronauts. they would rather not have to go out to fix a problem, they would rather have everything working fine. once you make the decision to go out there, you are looking to affect the space station and keep it going. probably, i think, the best experience any person can have, which is getting a chance to work in a space suit with cool tools on a magnificent machine, the space station ...

Consumeerables are doing and how things are working and what you want to try to get done the next day. a lot of people are working to make the right decision. >> i mentioned at the top as we look at the live picture it's exhilarating. you've actually done it. what does it feel like to do this? are you thinking about, you know, how potentially vulnerable you are? people think of the movie "gravity" and you can't help to think of those things but at the same time, this is what you trained for. how exhilarating is it really? >> very exhilarating. the movie "gravity" is a good movie, but you proba...