The caricature of science is that we hold tight to the theories we have, and shun challenges to them. That's just not true. In fact, we hold our highest rewards for those scientists who can prove others wrong. And by the way, they are famous in their own lifetimes. We don't wait until they're dead.

Note, however, that you cannot simply add temperatures the way you can add volumes or weights. Two people in bed, each with body temperatures of 98.6 degrees Fahrenheit, do not normally create a 197.2 degree under-the-cover oven.

Part of knowing how to think is knowing how the laws of nature shape the world around us. Without that knowledge, without that capacity to think, you can easily become a victim of people who seek to take advantage of you.

For me, one of the most fertile consequences of the space program is the extent to which it stimulates people to innovate because they want to create a different tomorrow than what they're living in today. And it's that culture of innovation that spawns entirely new economies.

No one is saying you're possessed by the devil anymore except the most ignorant of people in modern culture.

Not only do we live among the stars, the stars live within us.

Also, where does your identity come from? Your memory, of course.