A question I get asked a lot is 'What is it like to play the straight guy all the time?' And I'm totally okay with it.
I hope in my books I help children to see their strengths, and show them I have some idea of what they may occasionally be going through. Especially at tricky moments when it is easier to go back and evade things rather than go forwards and confront them.
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.