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To subscribe, E-mail the words . . And there is some evidence that exposure to environmental chemicals many be contributing to the phenomenon. The authors of the study say their sample of girls was not selected randomly and therefore may not accurately represent the entire U.S. population of female children. The early onset of puberty was observed in both white and African-American girls, but with significant differences between them. African-Americans showed the first signs of sexual maturity about a year earlier than whites.