Humans in space: why?

Humans in space: why?

Flying in space is a risky and expensive venture.  Why would we put humans at risk? We’ll take a trip to the International Space Station to see what it’s like to live in a research laboratory where everything is weightless.  We will then return to the Moon and see why we might want to go there again and perhaps build the first extraterrestrial research station.  Finally, we will look at what it might be like to go to Mars.  What do we gain from this effort and is it worth it to all of us on the Earth.