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The Invention Of Grandparents, And How They Changed The World
"The fundamental structure of human populations has changed exactly twice in evolutionary history. The second time was in the past 150 years, when the average lifespan doubled in most parts of the world. The first time was in the Paleolithic, probably around 30,000 years ago. That's when old people were basically invented." (And "old" means over 30.) Slate 09/09/13
Posted September 11, 2013 12:50 AM




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