In boxing, they say it's the punch you don't see coming that knocks you out. In the wider world, the reality we ignore or deny is the one that weakens our most impassioned efforts toward improvement.

'I realize they say we are 'wacko' and 'out there, but we are the most rational of all.

But as they say about sharks, it's not the ones you see that you have to worry about, it's the ones you don't see.

The things we do to our children - most of the evil in the world is not done with bad intentions but with the best intentions ever.

It isn't what they say about you, it's what they whisper.

People have been trying for centuries to manipulate genes, enhance certain traits, and achieve racial purity, even in humans. And of course I thought of the Nazis and their efforts toward Aryan magnificence.