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.

Black holes might be useful for getting rid of garbage or even some of one's friends.

Eternity is a long time, especially towards the end.

To confine our attention to terrestrial matters would be to limit the human spirit.

We only have to look at ourselves to see how intelligent life might develop into something we wouldn't want to meet.