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  2. Total fertility rate - Wikipedia

    en.wikipedia.org/wiki/Total_fertility_rate

    As of 2020, the total fertility rate for the world is 2.3 and as of 2021 it is 2.23. [6] The global TFR has declined rapidly since the 1960s, and some forecasters like Sanjeev Sanyal argue that the effective global fertility rate will fall below global replacement rate, estimated to be 2.3, in the 2020s.

  3. Anovulatory cycle - Wikipedia

    en.wikipedia.org/wiki/Anovulatory_cycle

    While the normal human menstrual cycle typically lasts 4 weeks (28 days, range 24–35 days) and consists of a follicular phase, ovulation, and a luteal phase followed by either menstruation or pregnancy, the anovulatory cycle has cycle lengths of varying degrees. In many circumstances, menstrual intervals are prolonged, reaching 35–180 days ...

  4. Socialist calculation debate - Wikipedia

    en.wikipedia.org/wiki/Socialist_calculation_debate

    Economics. The socialist calculation debate, sometimes known as the economic calculation debate, was a discourse on the subject of how a socialist economy would perform economic calculation given the absence of the law of value, money, financial prices for capital goods and private ownership of the means of production.

  5. Hindu units of time - Wikipedia

    en.wikipedia.org/wiki/Hindu_units_of_time

    Hindu units of time are described in Hindu texts ranging from microseconds to trillions of years, including cycles of cosmic time that repeat general events in Hindu cosmology. [1] [2] Time ( kāla) is described as eternal. [3] Various fragments of time are described in the Vedas, Manusmriti, Bhagavata Purana, Vishnu Purana, Mahabharata, Surya ...

  6. Babytalk (magazine) - Wikipedia

    en.wikipedia.org/wiki/Babytalk_(magazine)

    www .babytalk .com. ISSN. 1092-1869. Babytalk, America's oldest baby magazine, [1] was launched in 1935 as a supplement to customers of a national cloth diaper delivery service based in New Jersey. The free monthly publication aimed to help new mothers trust their maternal instincts with "straight talk" from experts and real moms.

  7. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    Slide rule. Typical ten-inch (25 cm) student slide rule (Pickett N902-T simplex trig) A slide rule is a hand -operated mechanical calculator consisting of slidable rulers for evaluating mathematical operations such as multiplication, division, exponents, roots, logarithms, and trigonometry.

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