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.

The more I learn about the universe, the less convinced I am that there's any sort of benevolent force that has anything to do with it, at all.

It is in the best interests of civilization and our economy and our nation to understand what objective truths are as revealed by the methods and tools of science.

If I'm looking fit and I'm not, then I'm cheating.

God displayed a sense of humor when he configured the region between our legs an entertainment complex built around a sewage system.

Science is not a subject you took in school. It's life. We are wrapped by it, in it, with it.

What I’m saying is, when different experiments give you the same result, it is no longer subject to your opinion. That’s the good thing about science: It’s true whether or not you believe in it. That’s why it works.