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Typical extended middle-class U.S. family from Indiana of Danish/German extraction. The woman in the lavender print dress is the 87-year-old great grandmother; her daughter, a 67-year-old grandmother, is next to her. They are surrounded by the third...

Why do humans have such a variety of appearances?

... to be able to recognise people who are part of your own group, even your own family. There are very special regions of the brain for ... recognise the facial differences there as you do in your own group. So that's one thing, we don't necessarily know how ...