"Spaceflight is still something we don't fully understand. We're finding things that we don't expect sometimes. This was one of those times and we're still piecing things together on this," said Barratt, the only member of the crew who had flown in space before.
Epps said everyone is different in how they respond to space -- and gravity. "That's the part that you can't predict," she said, adding, "Every day is better than the day before."
Dominick said little things like sitting comfortably in a hard chair took several days to get used to once he returned. He said he didn't use the treadmill at all during his time in space, as part of an experiment to see what equipment might be pared on a long trip to Mars.
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