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  2. Period (school) - Wikipedia

    en.wikipedia.org/wiki/Period_(school)

    One special example of a high school period is the free period. These typically involve having 15 minutes of mostly unsupervised activities. A free period (also called "free" "spare" "unstructured" or "leisure" period) is generally found in most high schools and colleges. During a free period, a student can either:

  3. Menstruation - Wikipedia

    en.wikipedia.org/wiki/Menstruation

    Diagram illustrating how the uterus lining builds up and breaks down during the menstrual cycle Menstruation (also known as a period, among other colloquial terms) is the regular discharge of blood and mucosal tissue from the inner lining of the uterus through the vagina. The menstrual cycle is characterized by the rise and fall of hormones. Menstruation is triggered by falling progesterone ...

  4. Science education - Wikipedia

    en.wikipedia.org/wiki/Science_education

    Science education is most commonly broken down into the following three fields: Biology, chemistry, and physics. Additionally there is a large body of scientific literature that advocates the inclusion of teaching the Nature of Science , which is slowly being adopted into the national curricula.

  5. Menstrual cycle - Wikipedia

    en.wikipedia.org/wiki/Menstrual_cycle

    Menstrual cycle The menstrual cycle is a series of natural changes in hormone production and the structures of the uterus and ovaries of the female reproductive system that makes pregnancy possible. The ovarian cycle controls the production and release of eggs and the cyclic release of estrogen and progesterone. The uterine cycle governs the preparation and maintenance of the lining of the ...

  6. Menarche - Wikipedia

    en.wikipedia.org/wiki/Menarche

    In the United States, some public schools have a sex education program that teaches girls about menstruation and what to expect at the onset of menarche (often this takes place during the fourth grade). Historically menstruation has been a social taboo and girls were taught about menarche and menstruation by their mothers or a female role model.

  7. Life history theory - Wikipedia

    en.wikipedia.org/wiki/Life_history_theory

    All organisms follow a specific sequence in their development, [9] beginning with gestation and ending with death, which is known as the life cycle. Events in between usually include birth, childhood, maturation, reproduction, and senescence, and together these comprise the life history strategy of that organism.

  8. Critical period - Wikipedia

    en.wikipedia.org/wiki/Critical_period

    In developmental psychology and developmental biology, a critical period is a maturational stage in the lifespan of an organism during which the nervous system is especially sensitive to certain environmental stimuli. If, for some reason, the organism does not receive the appropriate stimulus during this "critical period" to learn a given skill ...

  9. Early childhood education - Wikipedia

    en.wikipedia.org/wiki/Early_childhood_education

    Early childhood education (ECE), also known as nursery education, is a branch of education theory that relates to the teaching of children (formally and informally) from birth up to the age of eight. [1] Traditionally, this is up to the equivalent of third grade. [2] ECE is described as an important period in child development.