The main fuel to speed the world's progress is our stock of knowledge, and the brake is our lack of imagination.

We now have in our hands—really, in our libraries—the technology to feed, clothe, and supply energy to an ever-growing population for the next seven billion years.

Not understanding the process of a spontaneously-ordered economy goes hand-in-hand with not understanding the creation of resources and wealth.

All of us necessarily hold many casual opinions that are ludicrously wrong simply because life is far too short for us to think through even a small fraction of the topics that we come across.

Letting the religious right teach ID in schools is like letting the Marines teach poetry in advanced combat training. As a scientist, I see these the relevancy between the two sets to be equal. If Kansas is going to mess up like this, the least it can do is not be hypocritical and allow equal time for other alternative "theories" like FSMism, which is by far the tastier choice.

The world's problem is not too many people, but lack of political and economic freedom.

People call me an optimist, but I'm really an appreciator ... years ago, I was cured of a badly infected finger with antibiotics when once my doctor could have recommended only a hot water soak or, eventually, surgery.... When I was six years old and had scarlet fever, the first of the miracle drugs, sulfanilamide, saved my life. I'm grateful for computers and photocopiers ... I appreciate where we've come from.