But as the cerebellum degrades with age, so does the quality of memories. The memories are there, but they're not as good.

There are just two people entitled to refer to themselves as "we"; one is the editor and the other is the fellow with a tapeworm.

NASA is an engine of innovation and inspiration as well as the world's premier space exploration agency, and we are well served by politicians working to keep it that way, instead of turning it into a mere jobs program, or worse, cutting its budget.

My father was a very good Boy Scout. He was very skilled with knots, and he showed me how to tie a bow tie.

I say to the grown-ups, 'If you want to deny evolution and live in your world that's completely inconsistent with everything we've observed in the universe that's fine. But don't make your kids do it.'

If you look back on all the teachers that you liked, I am sure you will find they were very entertaining.

The philosophy of science is inherent in the process. This is to say, you think critically, you draw a conclusion based on evidence, but we all pursue discovery based on our observations. That's where science starts.