In part 4 of our new series, Humanity in Space, I take an in-depth look at the International Space Station. Born from a rousing State of the Union speech in 1984 from President Ronald Regan, the ISS started to be built in 1998. Get a look inside the station as I talk about some fo the various modules and hear from NASA astronauts Don Pettit and Nicole Stott about their time living in space.