You go to Indiana and you can't help but feel the pulse of the event everywhere.

Climate change is not the fault of man. It's Mother Nature's way. And sucking greenhouse gases from the atmosphere is too limited a solution. We have to be prepared for fire or ice, for fry or freeze. We have to be prepared for change.

In the two million years during which we climbed from stone-tool-wielding Homo erectus with sloping brows to high-foreheaded Homo urbanis - man, the inventor of the city - we underwent 60 glaciations, 60 ice ages.

New questions can produce new scientific leaps. They can tiddlywink new flips of insight and understanding. Big ones. Paradigm shifts.

How does a cosmos without a bearded, bathrobed God in the sky pull off all the things that a bearded, bathrobed guy in the sky was supposed to have pulled off? If there was no God who said 'Let there be light,' where did we get all that light?

There's plenty of material out there.