When you're in a spacecraft, you need to know what things you can touch and what things you shouldn't touch!

Computers allow us to squeeze the most out of everything, whether it's Google looking up things, so I guess that tends to make us a little lazy about reading books and doing things the hard way to understand how those things work.

I inherited depression from my mother's side of the family. Her father committed suicide. She committed suicide the year before I went to the moon.

There's no guarantee that the United States will be around 200 years from now.

I want to reach a new generation. That's why I am Twittering now. I have a BlackBerry, an iPhone and a Mac.

When we set out to land people on the surface of Mars, I think we should as a nation, as a world, commit ourselves to supporting a growing settlement and colonization there. To visit a few times and then withdraw would be an unforgivable waste of resources.

I realize that my life is not the common ordinary person.