Perhaps the best motivation for going to Mars is political. It is obvious that no single nation currently has either the will or the resources to do it alone, but a consortium of nations and space agencies could achieve it within 20 years.
“I know the district. I know a lot of people in the district. I know how to get where I'm going.”
“When my opera Plump Jack was performed in 1989, my first piano teacher sent me something that I'd composed when I was four. I remember I played it, and it still sounded like me. I'm the same composer I was then.”