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Read articles, including Science News stories written for ages 9-14, on the SNK website.
GROWING UP

Puberty is a multiyear process that has no clearly defined beginning or endpoint, making it difficult for researchers to study. While a girl’s age at her first period is a clear measure, other steps in the development of young bodies are more gradual. Credit: Source: www.merckmanuals.com, adapted by E. Feliciano

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