Protests break out in Charlotte, North Carolina, after fatal shooting of Keith Lamont Scott by a police officer (Photo by Sean Rayford/Getty Images)

Imagine a world in which all the babies born each day were randomly redistributed among the biological parents. The infant assigned to any given set of parents could be white, black, Asian, Hispanic, Native American, or any combination thereof (and that’s just the US); the baby could be perfectly healthy or grossly deformed. Parents would know only that their child was not their biological child. Let us call this social mixing.

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