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according-to-anthropologist-robin-dunbar-you-can
According to anthropologist Robin Dunbar, you can only have about 150 solid friendships. “Dunbar’s Number” is the theory that, due to our brain size and long-term memory capacity, we can only maintain stable relationships with a limited number of people. Anyone beyond that is just an acquaintance.  (, )
benjamin-franklin-designed-americas-very-first
Benjamin Franklin designed America’s very first one-cent coin, which was engraved with the caption: “Mind your business.”  (, , )