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In the early 1990s, some influential people said that being in single-sex classes could raise a girl’s self-esteem. Schools across the country began creating single-sex classrooms and schools. But many critics claim that all-female schools may actually be detrimental to a girl’ s education because they reinforce the regressive notion of sex differences. The renewed interest in single-sex schooling has fostered a controversy among Americans. Those who give it full endorsement believe girls need an all-female environment to take risks and find their own voices. Those who question the validity of single-sex schooling believe there is no such thing as separate but equal.