"There is a plan as the space station grows to take up a large space station manipulator arm, and once it is on the station, that will be able to help us with the construction....This new space station arm is able to walk, it can literally walk from one end to another. The beauty of that is that, as the station grows and becomes very large, you'd have a hard time designing any arm to do everything you wanted it to do. So what's been designed into the station is, either end of the arm can attach itself to any point on the station. So ideally you attach to an area where you need to work, and if a week later or days later you need to work in another area of the station, you can walk the arm around the station to position it to a more usable space to work."