Am I willing to go to Mars? Yes, but I'm not willing to spend nine months getting there, then wait 18 more months until the planets align to come home.

I stayed in the astronaut program until 1993. People ask me why I left. I thought I had a lot of things to contribute that would be difficult to do if I stayed. I thought I could have a stronger voice as an advocate for space exploration. So I ended up starting my own technology consulting company.

Mankind will not forever remain on Earth but, in the pursuit of light and space, will first timidly emerge from the bounds of the atmosphere and then advance until he has conquered the whole of circumsolar space.

Unless and until our society recognizes cyber bullying for what it is, the suffering of thousands of silent victims will continue.

If you don't like your job, then change it by getting some better skills. Until then, shut up and get my burger with a smile, like in the commercials.

I kept hiding my smile in pictures throughout middle school and most of high school until picture day came my senior year.

A game one of my sisters will play with me in my first year of being alive is called Good Baby, Bad Baby. This consists of being told I am a good baby until I smile and laugh, then being told I am a bad baby until I burst into tears. This training will stand me in good stead all through my life.

Not everything is going to be handed to you just because you're talented with a big smile. Sometimes you just gotta get out and shoot jumpers for hours and hours and hours. That's something I didn't really get a grasp on until way later, waking up early and treating it like a job if you're serious about it. Get the freak up and, you know, work.

It is clear I was never the Pretty Girl. I had my two front teeth knocked out when I was 10 and didn't fix them until I was 19. I have a crooked smile and a nose that looks like it's been broken 12 times but never has been. My nose was always red, so people called me Rudolph. My whole face is off-center.

The scientific content of Genesis 1-11 holds special significance for me because it revolutionized my thinking and, thus, changed my life's direction. Until I reached my late teens, my singular passion was science, astronomy in particular. My life's purpose was to learn more about the universe; nothing beyond that really interested me.

Science is not finished until it is communicated.

It is baffling, I must say, that in our modern world we have such blind trust in science and technology that we all accept what science tells us about everything - until, that is, it comes to climate science.

A fact is a simple statement that everyone believes. It is innocent, unless found guilty. A hypothesis is a novel suggestion that no one wants to believe. It is guilty, until found effective.

Everything is theoretically impossible, until it is done.

My parents were mourning the death of my sister. She was killed in a car accident before I was born, and I didn't know she existed until I was 13 or 14 years old. I knew I was growing up in a house where people were angry and sad.

When my dad passed, there's a lot of sadness right below the surface, and I think there will be until the day I die. So, writing sad songs helps it. And when I sing them, it's pure therapy for me.

That is sad until one recalls how many bad books the world may yet be spared because of the busyness of writers.

The sad truth is that the civil rights movement cannot be reborn until we identify the causes of black suffering, some of them self-inflicted. Why can't black leaders organize rallies around responsible sexuality, birth within marriage, parents reading to their children and students staying in school and doing homework?

I think I went through puberty really late in life or something. I always looked like a little, sad Thai boy up until I was 26.

The Violence Against Women Act didn't have specific provisions for Indian country until 2013, which is really sad. It's Native women who are the most vulnerable.

It takes a long time for a country to build a strong base in science, but only a short time to destroy it. Germany was a sad example. It was a world leader in the sciences for more than a century, until its science base was demolished during the Nazi era, and the country ceded its position to the United States.

I'm probably the furthest from being romantic that you've ever seen; I'm not even close to being romantic in any way until I have to be.

When I was pregnant, I had the romantic idea that after the baby was born I would not only take up reading in earnest again, but also write a novel while my daughter slept in her Moses basket. Of course, I barely had time to keep up with my magazines until she started sleeping properly.

I've had fun doing romantic comedies, but I just can't anymore. There's nothing fulfilling creatively, there's nowhere to grow, nothing to learn from it or for yourself. I'd rather just be home with my family or write music until that special project comes my way.