I think my inner voices are pretty good when it comes to warning of trouble. The problem is, I don’t always listen to them. - Charles Sheffield

A long time ago humans talked of terraforming Mars and Venus, but we never did it. Just too busy blowing ourselves up, I guess, ever to get round to it.

Lop the top-end tail off the distribution of human intelligence and creativity," he went on, "and it would make no measurable difference to the population. Only one person in a billion is out beyond the six-sigma level. That's what we're talking about here. But eventually those one-in-a-billion make a huge difference. Ninety-five percent of all human progress comes from less than one thousandth of one percent of the population.

Humans were inexplicable only if you assumed that they were logical.