Our three big emergencies are fire, loss of pressurization or contaminated atmosphere. Any of those things in a spaceship are very deadly and time critical. Everybody's trained, but I'm the commander of the ship, and it's up to me to decide.

I've had a chance to see something that is way outside everybody else's frame of reference and gives a perspective that is very different from everyone else's.

It's a really big deal to do a spacewalk. It's much riskier than staying indoors. It's complex. It uses up a lot of the precious resources onboard. It uses up oxygen. It uses up carbon dioxide scrubbers.

I've raised three kids: my wife and I have three kids. I've observed through direct contact the adults they are now is partially the product of where they came from and what we did. With them growing up, but partially how they were wired at birth.

When you look out the window of a spaceship, you see entire countries, vast swaths of continents. One turn of the head covers what once took thousands of years to traverse at ground level.

You should have a fear of some things. That doesn't mean it incapacitates you from your ability to figure out a way to deal with it.