I don't think I can explain it better than this : https://www.youtube.com/watch?v=6FCS5WQB-98

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Lookism starts in childhood. Children do it, adults do it.

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The impact is just crazy. People get more opportunities, get treated better, and are perceived as smarter, nicer. They get shorter sentences.

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The differences are bigger for men, so lookism affects men more.

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The link also disproves this myth running around that people find different faces attractive.

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To quote: "Adults are surprisingly consistent about what we consider good looking."