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  2. Boy or girl paradox - Wikipedia

    en.wikipedia.org/wiki/Boy_or_Girl_paradox

    The chance the family consists of a boy and a girl is ⁠ 14 / 27 ⁠, about 0.52. This variant of the boy and girl problem is discussed on many internet blogs and is the subject of a paper by Ruma Falk. [12] The moral of the story is that these probabilities do not just depend on the known information, but on how that information was obtained.

  3. Returning soldier effect - Wikipedia

    en.wikipedia.org/wiki/Returning_soldier_effect

    The returning soldier effect is a phenomenon which suggests that more boys are born immediately after wars. [1] [2] This effect is one of the many factors influencing human sex ratio. It was especially noticeable worldwide during and right after both of the World Wars. [3] The phenomenon was first mentioned by Ali. [4]

  4. Sperm competition - Wikipedia

    en.wikipedia.org/wiki/Sperm_competition

    However, multiple mates for a female means each individual male has decreased chances of producing offspring. Sperm competition is an evolutionary pressure on males, and has led to the development of adaptations to increase male's chance of reproductive success. [3] Sperm competition results in a sexual conflict between males and females. [2]

  5. Age disparity in sexual relationships - Wikipedia

    en.wikipedia.org/wiki/Age_disparity_in_sexual...

    Adolescent boys are generally sexually interested in adolescent girls and women somewhat older than they are. [8] Older men also display an interest in women of their own age. [9] However, research suggests that relationship patterns are more influenced by women's preferences than men's. [8] [10] [11]

  6. Fraternal birth order and male sexual orientation - Wikipedia

    en.wikipedia.org/wiki/Fraternal_birth_order_and...

    [19] [18] [note 2] Thus, if a male with no older brothers has a 2% chance of being homosexual and the fraternal birth order effect increases those chances by 33% for each older brother, then a male with one older brother has a 2.6% chance of being homosexual; a male with two older brothers has a 3.5% chance, and males with three and four older ...

  7. AOL Mail

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  8. Precocious puberty - Wikipedia

    en.wikipedia.org/wiki/Precocious_puberty

    [18] While more girls are increasingly entering puberty at younger ages, new research indicates that some boys are actually starting later (delayed puberty). [ 21 ] [ 22 ] "Increasing rates of obese and overweight children in the United States may be contributing to a later onset of puberty in boys, say researchers at the University of Michigan ...

  9. Expect big things from this trio of local high school girls ...

    www.aol.com/expect-big-things-trio-local...

    At season's end, Flagg placed behind only a junior and sophomore in the D2 All-State race, in 18:54.68. That came after a week after she won her state qualifier by 12.4 seconds, in 18:23.8 ...