““On the Soyuz, there’s simply not room to fly someone whose main contribution is expertise in a single area. The Russian rocket ship only carries three people, and between them they need to cover off a huge matrix of skills. Some are obvious: piloting the rocket, spacewalking, operating the robotic elements of the ISS like Canadarm2, being able to repair things that break on Station, conducting and monitoring the numerous scientific experiments on board. But since the crew is going to be away from civilization for many months, they also need to be able to do things like perform basic surgery and dentistry, program a computer and rewire an electrical panel, take professional-quality photographs and conduct a press conference—and get along harmoniously with colleagues, 24/7, in a confined space.””
