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" I am not a great sleeper. I don't think I have ever slept 8 hours straight in the last 20 years. "

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" Sleeping here is harder here in space than on a bed because the sleep position here is the same position throughout the day. You don't ever get that sense of gratifying relaxation here that you do on Earth after a long day at work. "

" If you go on a journey to Mars and get into deep space, there is several hundred times, maybe 300 times the radiation. "

" Space has its own unique smell. So whenever a vehicle docks, or if guys are out doing a spacewalk, the smell of space when you open up the hatch is very distinct. It's kind of like a burning-metal smell, if you can imagine what that would smell like. "

" People do really well on space missions, but it's the physiological, the medical stuff, the stuff like radiation, loss of bone mass and muscle mass and density. It's those things that we need to figure out. "

" On this flight, my fourth spaceflight, I also became the record holder for total days in space and single longest mission. "

" Just like the bones and muscles, the heart is designed to work in one gravity here on Earth, so when you put the heart in space, it operates differently and changes shape. "

" I'll never be done with space. I will always be involved. "

" I am humbled and excited by new opportunities for me to support and share the amazing work NASA is doing to help us travel farther into the solar system and work with the next generation of science and technology leaders. "

" There are definitely parts of Asia, Central America that when you look at them from space, you're always looking through a haze of pollution. As far as the atmosphere is concerned, and being able to see the surface, you know, I would say definitely those areas that I mentioned look kind of sick. "

" The space station here is a magical place and an incredible science facility. "

" I'm actually thinking about maybe, on a spacewalk, not wearing my glasses. I normally wear those both for reading and a little bit of a distance correction, but the distance vision seems like it's gotten a little bit better. So I might go without. "

" The majority of astronauts have to change their eyeglasses while in space. They bring eyeglasses with them and typically change a few months into the mission. "

" I don't mean to say it's not fresh on the space station, but there's nothing like new, cold air coming into the capsule. "

" My career with the Navy and NASA gave me an incredible chance to showcase public service to which I am dedicated, and what we can accomplish on the big challenges of our day. "

" If we're going to go farther from Earth, to Mars or somewhere else someday, we have to have a good understanding of the psychological impact on people. And not only psychologically, but how it affects their cognition. We're doing a lot of research on my cognitive abilities. "

" What we get from building a space station, the economic return, the science return, is very, very important to our nation, to our economy. "

" As far as whether there is life there on Mars or whether there was actually ever life there, I don't know. It would be great to find out, though. "

" Something people don't recognize is that being on the space station is probably a lot like being in some kind of confinement - like isolation. "

" The calluses on your feet in space will eventually fall off. So, the bottoms of your feet become very soft like newborn baby feet. But the top of my feet develop rough alligator skin because I use the top of my feet to get around here on space station when using foot rails. "

" Flying in space is a privilege, whether it's the first time or the fourth time. "

" There's certainly a loss of connection with folks on the ground who I care for and love and I want to spend time with. "

" When we do things that are really hard, we can achieve great things - and that has worked as a great model for me. "

" When you look at the... atmosphere on the limb of the Earth, I wouldn't say it looks unhealthy, but it definitely looks very, very fragile and just kind of like this thin film, so it looks like something that we definitely need to take care of. "

" It's a combination of science, maintenance, and general housekeeping. And then, occasionally, robotics activities or a spacewalk you might get to do. "

" The ride to orbit was impressive, as it always is. But once I got on board the space station, it really felt like I was visiting an old home; it felt very comfortable. "

" Me, personally, I was a Mets and Giants fan. "

" There are parts of the Earth that are covered with pollution all the time. I saw weather that was unexpected. Storms bigger than we've seen in the past. This is a human effect. This is not a natural phenomenon. "

" A lot of the data we collect is stuff that has to be analyzed on the ground. For instance, we can't see, you know, bone loss. Our cells, you know, that's something that we'll have to notice with imaging technology when I get back. "

" It's an international space station. We have crew members from both the U.S. and Russia and now the United Kingdom with Tim Peake from the U.K... It's great to see that, on this space station, that we can work across cultures in a very cooperative way. "

" I think anyone that's in the same building or the same place for a really long period of time, some parts of it become routine. "