There are times when you devote yourself to a higher cause than personal safety.

America had an emphasis on the individual and so education became available for everyone.

We (the DOE) are poisoning our people in the name of national security.

I was sold on flying as soon as I had a taste for it.

The moment of twilight is simply beautiful.

Just because I'm 77 doesn't mean I don't have a dream.

There is still no cure for the common birthday.

I am a stranger. I come in peace. Take me to your leader and there will be a massive reward for you in eternity.

Zero G and I feel fine.

Too many people, when they get old, think that they have to live by the calendar.

I don't know what you could say about a day in which you have seen four beautiful sunsets.

To sit back and let fate play its hand out and never influence it is not the way man was meant to operate.

We have an infinite amount to learn both from nature and each other.

I wanted to be a professional dancer for some time, and I did a lot of dancing and choreography and got paid for it.

Some of the most fun people I know are scientists.

When God made the colour purple, God was just showing off.

The arts and sciences are avatars of human creativity.

I always knew I'd go to space.

The thing that I have done throughout my life is to do the best job that I can and to be me.