Whatever the reason you're on Mars, I'm glad you're there, and I wish I was with you.

There is a report that says that kids who watch violent TV programs tend to be more violent when they grow up. But did the TV cause the violence, or do violent children preferentially enjoy watching violent programs?

We are, each of us, a multitude. Within us is a little universe.

One of the reasons for its success is that science has a built-in, error-correcting machinery at its very heart. Some may consider this an overbroad characterization, but to me every time we exercise self-criticism, every time we test our ideas against the outside world, we are doing science. When we are self-indulgent and uncritical, when we confuse hopes and facts, we slide into pseudoscience and superstition.

If all the suns but ours collapsed tonight, how many lifetimes would it take us to realize that we were alone?

I think if we ever reach the point where we think we thoroughly understand who we are and where we came from, we will have failed.

We are all star stuff.