Proof that life is getting better for humanity, in 5 charts - Vox: "If you think science, technology, and political freedom are important to solve the world’s problems, and you think that it helps to read and write in order to use such tools, then look at the figures in absolute numbers. In 1800, there were 120 million people in the world who could read and write; today there are 6.2 billion with the same skill.
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