The US Navy has several people on every ship that can navigate by the stars. They don't fool with that.

I've got no problem with anybody's religion. But if you go claiming the Earth is only 10,000 years old, that's just wrong.

Science is the key to our future, and if you don’t believe in science, then you’re holding everybody back. And it’s fine if you as an adult want to run around pretending or claiming that you don’t believe in evolution, but if we educate a generation of people who don’t believe in science, that’s a recipe for disaster. We talk about the Internet. That comes from science. Weather forecasting. That comes from science. The main idea in all of biology is evolution. To not teach it to our young people is wrong.

I like to regard myself as someone who's capable of critical thought, that is to say, who can evaluate claims.

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

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.

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.