The countries that send people to ISS are Canada , Japan , Russian Federation ,  and
United States. Some of the features of the ISS is the airlocks , the truss and the
laboratories.  The ISS is up there because we need space aircraft so we can explore
more things and new things in space. They study about what happens to people when 
they live in space. We also pay alot of money to keep the ISS up there so they can 
still  study about what people are like when they are living in space.