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Since the Enlightenment unfolded in the late 18th century, life expectancy across the world has risen from 30 to 71, and in the more fortunate countries to 81.1 When the Enlightenment began, a third of the children born in the richest parts of the world died before their fifth birthday; today, that fate befalls 6 percent of the children in the poorest parts. Their mothers, too, were freed from tragedy: one percent in the richest countries did not live to see their newborns, a rate triple that of the poorest countries today, which continues to fall. In those poor countries, lethal infectious diseases are in steady decline, some of them afflicting just a few dozen people a year, soon to follow smallpox into extinction. The poor may not always be with us. The world is about a hundred times wealthier today than it was two centuries ago, and the prosperity is becoming more evenly distributed across the world’s countries and people. The proportion of humanity living in extreme poverty has fallen from almost 90 percent to less than 10 percent, and within the lifetimes of most of the readers of this book it could approach zero. Catastrophic famine, never far away in most of human history, has vanished from most of the world, and undernourishment and stunting are in steady decline. A century ago, richer countries devoted one percent of their wealth to supporting children, the poor, and the aged; today they spend almost a quarter of it. Most of their poor today are fed, clothed, and sheltered, and have luxuries like smartphones
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Steven Pinker (Enlightenment Now: The Case for Reason, Science, Humanism, and Progress)