Nothing is fool-proof to a sufficiently talented fool.

[In the Universe it may be that] Primitive life is very common and intelligent life is fairly rare. Some would say it has yet to occur on Earth.

I thought Eddie Redmayne portrayed me very well... At times I thought he was me.

If there really is a complete unified theory that governs everything, it presumably also determines your actions. But it does so in a way that is impossible to calculate for an organism that is as complicated as a human being. The reason we say that humans have free will is because we can't predict what they will do.

I'd say I don't believe in God, but I'm afraid He might hear me.

To boldly go where no one has gone before

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.