The space station is moving 17,500 miles an hour, but so are you. So it's kind of like doing a wing. Wing walking on an airplane, but with no air to blow you off the wing. So when you look at the space station is rock solid, but you look down and some people get the fear of falling, and then they hold on real tight, which is a terrible, terrible mistake because we call it space walking. But you're not walking. You're doing everything with your arms.