Ordinary Americans today enjoy a living standard that would have awed kings for most of human history. We live in homes conditioned to our ideal temperature in any season; drive vehicles that pack the power of 250 horses into a 100-square-foot metal frame; carry six-ounce rectangles that offer instant access to virtually any loved one, book, song, fact, or pornography; inhale gases that take the pain out of any surgery; replace our worn-out hips with titanium; glide 40,000 feet above the Earth i...

Ordinary Americans today enjoy a living standard that would have awed kings for most of human history. We live in homes conditioned to our ideal temperature in any season; drive vehicles that pack the power of 250 horses into a 100-square-foot metal frame; carry six-ounce rectangles that offer instant access to virtually any loved one, book, song, fact, or pornography; inhale gases that take the pain out of any surgery; replace our worn-out hips with titanium; glide 40,000 feet above the Earth i...