Apparently there is redundancy in memory: You store the same memory in different parts of your brain for accessing at different speeds. That speed would depend on the frequency of use and the importance of the knowledge.

I always say when you see that old black-and-white footage of the rocket on the launch pad and it falls over and explodes, that's because people had slide rules. Not having the decimal point is a real drawback. You want the decimal point, take it from me.

If NASA is to reach beyond the Moon and someday reach Mars, it must be relieved of the burden of launching people and cargo to low earth orbit. To do that, we must invest more in commercial spaceflight.

Anybody who grew up with the space program is a fan of science fiction.

To leave the world better than you found it, sometimes you have to pick up other people's trash.

People and stars are made of the same stuff.

People get a lot out of being religious. They have strong senses of community and mutual support. So, what's not to love [there]?