We are just a speck, on a speck, orbiting a speck, in the corner of a speck, in the middle of nowhere.

For me, the meaning of life is pretty clear: Living things strive to pass their genes into the future.

If you just take a single human and put him or her in the forest he or she might not do very well without some sort of education which he got or she got from some tribe.

The oncoming trouble I speak of is climate change. It's going to affect all of you in the same way the Second World War consumed people of my parent's generation.

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.

Tax dollars intended for science education must not be used to teach creationism as any sort of real explanation of nature, because any observation or process of inference about our origin and the nature of the universe disproves creationism in every respect.

If you meet somebody who says he or she has never dreamed of flying, I don't believe you. I mean, they're lying.