With current technology interstellar travel is utterly impractical. Alpha Centauri can never become a holiday destination. - Stephen Hawking

general theory of relativity and quantum mechanics. They are the great intellectual achievements of the first half of this century.

So Einstein was wrong when he said, "God does not play dice." Consideration of black holes suggests, not only that God does play dice, but that he sometimes confuses us by throwing them where they can't be seen.

It is hard to imagine how free will can operate if our behavior is determined by physical law, so it seems that we are no more than biological machines and that free will is just an illusion.