Simplicity is a matter of taste

Of course it is possible that UFO's really do contain aliens as many people believe, and the government is hushing it up

Any physical theory is always provisional, in the sense that it is only a hypothesis: you can never prove it.

It often happens that I have an idea, but then I try to fill in the intermediate steps and find they don't work, so I have to give it up.

The downside of my celebrity is that I cannot go anywhere in the world without being recognized. It is not enough for me to wear dark sunglasses and a wig. The wheelchair gives me away.

There should be a better way to start a day than waking up every morning.

Although September 11 was horrible, it didn't threaten the survival of the human race, like nuclear weapons do.