Most people are trichromats, possessing three types of cone cells to see color with. A woman in northern England has four types of working cone cells, which means she has the ability to see far more colors than most of us can. According to estimates, that means she can see an incredible 99 million more colors than the rest of us, and the scientists think she’s just one of a number of people with super-vision, which they call “tetrachromats”, living amongst us.
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