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  2. List of unsolved problems in chemistry - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    This article needs attention from an expert in chemistry. The specific problem is: Incomplete list. WikiProject Chemistry may be able to help recruit an expert.

  3. Youth culture - Wikipedia

    en.wikipedia.org/wiki/Youth_culture

    The goal of this stage of life is to answer the question, "Who am I?" In many societies, adolescents are expected to behave like children and take on adult roles. Some psychologists have theorized that forming youth culture is a step to adopt an identity that reconciles these two conflicting expectations.

  4. Adolescence - Wikipedia

    en.wikipedia.org/wiki/Adolescence

    The average age of onset of puberty is 10–11 for girls and 11–12 for boys. [10] [11] Every person's individual timetable for puberty is influenced primarily by heredity, although environmental factors, such as diet and exercise, also exert some influences. [12] [13] These factors can also contribute to precocious and delayed puberty. [14] [13]

  5. Adolescent health - Wikipedia

    en.wikipedia.org/wiki/Adolescent_Health

    Adolescent health, or youth health, is the range of approaches to preventing, detecting or treating young people's health and well-being. [1] The term adolescent and young people are often used interchangeably, as are the terms Adolescent Health [2] and Youth Health. Young people's health is often complex and requires a comprehensive ...

  6. Child development - Wikipedia

    en.wikipedia.org/wiki/Child_development

    Middle childhood/preadolescence or ages 6–12 universally mark a distinctive period between major developmental transition points. [2] Adolescence is the stage of life that typically starts around the major onset of puberty , with markers such as menarche and spermarche, typically occurring at 12–14 years of age. [ 3 ]

  7. Preadolescence - Wikipedia

    en.wikipedia.org/wiki/Preadolescence

    Generally, the term is restricted to those close to reaching age 13, [1] especially ages 9 to 12. [3] Tween is an American neologism and marketing term [10] for preteen, which is a blend of between and teen. [9] [11] People within this age range are variously described as tweens, preadolescents, tweenies, preteens, pubescents, middle schoolers ...

  8. Teenage pregnancy - Wikipedia

    en.wikipedia.org/wiki/Teenage_pregnancy

    In 1995, the National Longitudinal Study of Adolescent Health surveyed 1,027 students in the US in grades 7–12 to compare the use of contraceptives among Whites, Blacks, and Hispanics. 36.2% of Hispanics said they never used contraception during intercourse, compared to 23.3% of Black teens and 17.0% of White teens who did not use ...

  9. Crowds (adolescence) - Wikipedia

    en.wikipedia.org/wiki/Crowds_(adolescence)

    Adolescents’ attitudes toward crowds change over time—while ninth-graders are willing to discriminate against members of other crowds, twelfth-graders are less likely to do so. [19] Adolescents also develop more multifaceted self-concepts and reject crowd labels as simplistic attempts to describe an entire personality. [ 9 ]