Some of the billions alive today still live in misery and want even worse than the worst experienced in the Stone Age. Some are worse off than they were a few months or years before. But the vast majority of people are much better fed, much better sheltered, much better entertained, much better protected against disease and much more likely to live to old age than their ancestors have ever been. The availability of almost everything a person could want has been going rapidly upward for two hundred years and erratically upward for ten thousand years before that: years of life span, mouthfuls of
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