Astronaut Carl Walz once lived on the International Space Station (ISS) for 196 days–about six and a half months. That’s a long time to look down at Earth, and not be able to touch it. Before he went up in 2001, Walz recalls, the psychological support people asked him what kind of things he’d be interested in taking along. “I said, ‘Well, a keyboard would be nice.’ And they said, ‘We’ll look into that.'”