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.

The thing about a theory in science is it allows you make predictions. Evolutionary theory allows us to predict what apples will taste good next harvest.

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

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

Climate change is happening, humans are causing it, and I think this is perhaps the most serious environmental issue facing us.

Reading their letters and the First Amendment of the US Constitution, I infer that this nation's founders noted that religions have been at the center of great deal of trouble, so they precluded the US government from getting involved in religion, i.e. "... shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof..." Over the centuries, various religions have laid claim to various morals; consider the difficulties outsiders are having today in the Middle East, for example.

I hope climate science becomes the big thing. And then what I want is electrical engineers to solve the world's energy problems, energy distribution problems. I want mechanical engineers to make better transportation systems. I want chemical engineers to develop better solar panels, and so on.