Perhaps, therefore, it is odd that if there is any one phrase that is guaranteed to set me off it's when someone says to me, 'OK, fine. You're the boss!' What irks me is that in 90% of such instances what that person is really saying is, 'OK, then, I don't agree with you, but I'll roll over and do it because you're telling me to. But if it doesn't work out I'll be the first to remind everyone that it wasn't my idea.'

My mother always taught me never to look back in regret but to move on to the next thing.

I've used the Phoenix Centrifuge to replicate what the body's going to go through on the flight up. I've also done some gravity tests with ZERO-G [a charter-flight service in Arlington, Va., that uses modified Boeing 727s to simulate weightlessness], which went great.

Having no regrets makes way for the best piece of advice I can give - don't be afraid of failure.

If family or friends are unwell or ill - it's perhaps the only thing that really can make one feel vulnerable.

People flourish if they’re praised.

I have always lived my life by thriving on opportunity and adventure. Some of the best ideas come out of the blue, and you have to keep an open mind to see their virtue.