Did you know that the International Space Station has been occupied by humans from earth for about 15 years? It has! If you want an example of people from different countries working together, just look at the ISS. It was built by several nations, and the astronauts living there at any given time are from different countries.
It's a place where research to benefit all of mankind is carried out. Some of those experiments are in the fields of biology, microbiology, space medicine, physics, astronomy, and meteorology. These are all fields related to things teens are beginning to study in school, and they may be excited to know that an interest in these fields can carry them into space.
Would you like to be one of the scientists living and working on the International Space Station one day? If you would like to find out a little bit about what it's like, you might consider attending a session of Space Camp, where young people can learn a lot about what NASA does, and even experience what some of the astronaut training is like.