comments that were made about the reusable, the first reusability coming with the space shuttle, of course, and then going on, and now we look at all three major commercial carriers are looking at reusability from spacex, virgin galactic and blue origin. this is really building a robust infrastructure that we can continue to expand upon. >> commander kelley, you and your twin brother have been involved in experiments so see the effects of space on the human body. you, i believe, if not the longest time in space, but one of the longest times in space that you have spent. what are you feeling right now? granted, theirs is 11 minutes as opposed to the months you were in space. what are the doctors going to be asking them -- as we watch the crew applaud and we watch them come out, i imagine what stress.