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  2. Pendulum - Wikipedia

    en.wikipedia.org/wiki/Pendulum

    The time for one complete cycle, a left swing and a right swing, is called the period. The period depends on the length of the pendulum and also to a slight degree on the amplitude, the width of the pendulum's swing. The regular motion of pendulums was used for timekeeping and was the world's most accurate timekeeping technology until the 1930s ...

  3. Business cycle - Wikipedia

    en.wikipedia.org/wiki/Business_cycle

    t. e. Business cycles are intervals of general expansion followed by recession in economic performance. The changes in economic activity that characterize business cycles have important implications for the welfare of the general population, government institutions, and private sector firms. There are many specific definitions of a business cycle.

  4. Menopause - Wikipedia

    en.wikipedia.org/wiki/Menopause

    Menopause is the opposite of menarche, the time when a girl's periods start. [ 11 ] In the years before menopause, a woman's periods typically become irregular, [ 12 ] [ 13 ] which means that periods may be longer or shorter in duration or be lighter or heavier in the amount of flow. [ 12 ]

  5. Attention span - Wikipedia

    en.wikipedia.org/wiki/Attention_span

    Attention span. Attention span is the amount of time spent concentrating on a task before becoming distracted. [1] Distractibility occurs when attention is uncontrollably diverted to another activity or sensation. [2] Attention training is said to be part of education, particularly in the way students are trained to remain focused on a topic of ...

  6. Alzheimer's disease - Wikipedia

    en.wikipedia.org/wiki/Alzheimer's_disease

    [260] [261] Regarding economic problems, family caregivers often give up time from work to spend 47 hours per week on average with the person with Alzheimer's disease, while the costs of caring for them are high. Direct and indirect costs of caring for somebody with Alzheimer's average between $18,000 and $77,500 per year in the United States ...

  7. 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 ...

  8. Puberty - Wikipedia

    en.wikipedia.org/wiki/Puberty

    Puberty is the process of physical changes through which a child 's body matures into an adult body capable of sexual reproduction. It is initiated by hormonal signals from the brain to the gonads: the ovaries in a female, the testicles in a male.

  9. Inflation - Wikipedia

    en.wikipedia.org/wiki/Inflation

    Mostly, the medieval inflation episodes were modest, and there was a tendency that inflationary periods were followed by deflationary periods. [ 26 ] From the second half of the 15th century to the first half of the 17th, Western Europe experienced a major inflationary cycle referred to as the " price revolution ", [ 40 ] [ 41 ] with prices on ...

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