Physical differences can mean a great number of topics. Here is a list of keywords that might help generate topic ideas:
physical differences, appearance, similarities, deformed, abnormal, plastic surgery, perception, beauty, genetics, physical anthropology, biological anthropology, attractiveness, discrimination, race, relationships, irrational decisions, interaction, age, disability, employment, language, nationality, ethnicity, sex, gender, gender identity, reverse discrimination, quota, caste, labeling theory, stigma, bullying, genocide
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