You’ve probably had the following experience: You are reading along when a map, shaded in a procession of pastels, interrupts the story. Your eyes travel first to your home country, then to the country where you spent a summer abroad, and then, finally, sweep around the map looking for the brightest or dimmest shades that mark a place is the most or least of something. Along the way you cross a vast colorless expanse where Central Africa should be. “No data,” the legend explains.

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