"When I was trying to figure out why lives have improved so much in the last 300 years, where we've gone from a third of kids dying before 5 to - by 1990 it was down to 10% - now it's down to 5%. And saying why, over all history, there were smart people, but that number didn't change. Average life span didn't change. What's magical about what's been deemed the Industrial Revolution? It's really energy intensity."

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One of the things that got me on this topic for this book was that when I was researching the column I wrote in 2009 saying that I was stepping down from my column at "Newsweek" because I wanted to make room for newer, fresh voices out there, I discovered that in the year I was born, 1952, the average life expectancy of an American was 68. I was shocked by that figure and every time I mention it I hear a gasp from somebody in the crowd. Now, of course, we're more or less at 80, so that means that we've gotten 12 additional years.

— Anna Quindlen