Failure concentrates the mind wonderfully. If you don't make mistakes, you're not trying hard enough.

Aspects that we consider normal today could very well be repugnant in the future - eating animals, for one thing, or abundant choice, or invasive surgery. I was simply trying to demonstrate that what is acceptable today may not be acceptable forever, and vice-versa.

Yes, and imagine a world where there were no hypothetical situations.

There is much unexplained in the world. It behooves us to be wary at all times. Just when you think you've got the hang of it, along comes string theory, collateralized debt obligations or Björk's new album, and bam! You're as confused as you were when you first started.

He was, after all, the ultimate rebel -- it takes a lot of cojones to stand up to Zeus.

We all make mistakes at some time in our lives, some more than others. It is only when the cost is counted in human lives that people really take notice.

Failure concentrates the mind wonderfully. If you don't make mistakes, you're not trying hard enough.