My optimism and confidence come not from feeling I'm luckier than other mortals, and they sure don't come from visualizing victory. They're the result of a lifetime spent visualizing defeat and figuring out how to prevent it. Like most astronauts, I'm pretty sure that I can deal with what life throws at me because I've thought about what to do if things go wrong, as well as right. That's the power of negative thinking.

Things aren't scary. People are scared.

In the van, we can see the rocket in the distance, lit up and shining, an obelisk. In reality, of course, it’s a 4.5-megaton bomb loaded with explosive fuel, which is why everyone else is driving away from it.

Nothing focuses your mind quite like flying a jet. That's one reason NASA requires that astronauts fly T-38s: it forces us to concentrate and prioritize in some of the same ways we need to in a rocket ship.

We have never lost a crew member on the space station, but of course, the Columbia accident. I was - I'd already been an astronaut for a decade when the crew of Columbia was killed. And I went through test pilot school. Rick Husband and I were out at Edwards at test pilot school together. He was the commander of Columbia.

In the astronaut business - the shuttle is a very complicated vehicle; it's the most complicated flying machine ever built. And in the astronaut business, we have a saying, which is, 'There is no problem so bad that you can't make it worse.'

And now for Return to Flight, I'm chief of robotics working in the astronaut office in Houston, as a Canadian.

When I was nine, I wanted to be an astronaut but at that time there weren't any Canadian astronauts. You had to be American or Soviet. So many things will be possible in your lifetimes.