If there is a God, he has left no tracks in the laws of physics; or if he has, he has covered them up very well. - Ivar Ekeland

Well, it has been a long time since manna last fallen from heaven. We cannot live alone; we rely on others to produce the stuff of our material and intellectual life, and we have to organize society so that its members will cooperate toward the common good.

It is a testimony to the power of education that classical mechanics could operate for so long under a mistaken conception. Teaching and research concentrated on integrable systems, each feeding the other, until in the end we had no longer the tools nor the interest for studying nonintegrable systems.

The moment when the scientists became engineers was a historical turning point.