The questions I find myself coming back to: At what point do science and religion separate themselves, or are forced to be separated? When is sustainability about science and not culture, and if it veers into culture, does it, too, border on religion? Why didn't I pay better attention in astrophysics class when we were discussing potential multi-verses? It was a hard book on which to get started, but after the first 100 pages, I didn't put it down. I've thought (for years) it would be hard to top Cryptonomicon (the "Baroque Cycle" didn't capture me, although I'm about to restart it), but Stephenson raised the bar with his latest. It even has a solid and comforting conclusion, rather than a fade out in words.