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social identity in group bias out group out groups vs in groups bias minimal group paradigm adidas puma Rudolf Dassler Adi Dassler sibling rivalry shoemakers Herzogenaurach town of bent necks henri tajfel social psychology psychology social status sense of self identity group identity group bias psychology of groups history science education animation jay van bavel Dominic Packer Arvind Singh Jeena Totem Creative TED TED-Ed TED Ed Teded Ted Education