A scientist is just a kid who never grew up.

With no gravitational force to work against, your body not only doesn't need the same amount of muscle and bone, it starts breaking them down. As on Earth, so in space: use it or lose it. And exercise may not solve the problem.

I want people to see that the cosmic perspective is simultaneously honest about the universe we live in and uplifting, when we realize how far we have come and how wonderful is this world of ours.

Climate change has taken on political dimensions. That's odd because I don't see people choosing sides over E=Mc2 or other fundamental facts of science.

We need more science in the world. Train me.

Passion is what gets you through the hardest times that might otherwise make strong men weak, or make you give up.

I always wanted to be respected for my mind.