nearly 400 kilometers above the earth's surface, the international space station continues its orbit, where it has been every day for the last 16 years. a six-person crew lives onboard. their official titles are astronaut or cosmonaut, but their day job is really scientist. at its core, the iss is a science laboratory. there are experiments that help us understand earth and space, of course, but also the human body and medicine. >> there are parts of the vibration isolation stabilization system, they're kind of little shock absorbers.