117

Support for the claim appears to rest on explicit birth records, although interviews with families in the village were also conducted. The New York Post writes (emphasis mine) According to birth records, there hasn’t been a boy born there since 2009, though 12 girls have come into the world in that time frame. I did some digging and was unable to access ...


40

Generally if such statistics would exist, they would be available to every Polish citizen per freedom of information act. Alas, there are no such statistics in Poland. While the claim might be true, citing birth records is a sure sign of a fake. I know well which sources are available and who can get it, because I've worked for years as a reporter in Poland. ...


14

Source A famous method for gender selection is the Shettles Method, which makes use of the "male (Y) sperm are faster than female (X) sperm " theory. But according to Entrenched misinformation about X and Y sperm (2006): The widely held idea that spermatozoa bearing the Y chromosome (Y sperm) swim faster than those bearing the X chromosome (X ...


14

This says that the claim is a "popular Greek view" followed by Aristotle: Contrary to a popular Greek view, which regarded the father alone as providing seed, a view that would be followed by Aristotle (Lloyd 1983, 86 ff.), Alcmaeon may have argued that both parents contribute seed (DK, A13) and that the child takes the sex of the parent who contributes ...


14

Yes. Homo sapiens is, as far as we know, the only species that has permanently enlarged breasts. In the rest of the primates, plump breasts last only as long as breastfeeding does: Humans are the only primate to have breasts that are enlarged at all times, in contrast to other primates which have swollen breasts only when breastfeeding. This ...


13

According to American Pregnancy it looks really improbable. Similar statements are made on the Oakland University website and on this website about contraception (which explicitly states it's impossible). The girls should have been swimming naked and the "father" should have ejaculated just outside her vagina as sperm would be killed in a few second in the ...


11

TL;DR This is almost certainly true The US department of Census reports in 2010 there were 35,218,000 households with "own children under 18 years" (This probably excludes some households with children, such as those being raised by someone other than the parents). This is out of a total number of households of 117,538,000. Dog statistics are a little ...


11

Unlikely but possible according to http://www.americanpregnancy.org/preventingpregnancy/pregnancyfaqmyths.html Can sperm travel through clothing or material? If the clothing was completely saturated with semen and was in direct contact with a woman’s vagina, there is a very slight chance the sperm could enter the vagina, but this is highly unlikely. No ...


11

This meta-analyis examines 50 years of sperm count data and finds that time is a weak predictor of sperm count. They fitted a linear (straight) and quadratic (curved) line to the data. Note that in the scatterplots each data point is a study, not an individual. The result was: Our assessment of sperm quality over time leads to the conclusion that ...


11

No, it takes more than one sperm. The egg has multiple barriers which take up to 100 sperm, co-operating, to penetrate. The fusion of the egg with its three barriers (cumulus-oocyte complex, zona pellucida and finally the plasma membrane) takes approximately 10 sperm to clear the first two barriers of the oocyte referring to De Jonge and up to 100 sperm to ...


10

Yes it is possible. See Father's Milk Discover February 1995. We’ve known for some time that many male mammals, including some men, can undergo breast development and lactate under special conditions. ... Breast development occurs commonly, and spontaneous lactation occasionally, in men under conditions of starvation. Thousands of cases were ...


9

There are studies that has shown a link between what you eat and how likely you are to get a girl or a boy. The difference is very small though, and "sour" doesn't seem to be relevant. The only food item they studied that had an effect seemed to have been cereal. http://www.psychologytoday.com/blog/homo-consumericus/201006/women-s-preconception-diets-and-...


9

I couldn't find anything in the scientific literature, but then I thought I had found the answer. I read the description of an experiment performed by the BBC show The Truth About Food. Not peer-reviewed scientific journal, but perhaps the best you can hope for on a question that is unlikely to get normal funding. It sounded promising. Their video link is (...


9

This is absolutely true. The theory is called Preformationism, and was widely (though not exclusively) believed in some form from Ancient Greek times until the 17th century. Pythagoras and Aristotle are among the philosophers associated with this theory. Some qualifications: spermatozoa were not known to exist until the invention of the microscope. However ...


7

This is not my area of scientific expertise. I cannot say if this study by Wilder et al is correct or not, but I can read the study and compare their conclusions to Baumeister's. Wilder et al conclude that women outnumber men in human ancestry, but they do not conclude that the ratio is two to one. They make a different conclusion about a two to one ratio, ...


7

No. And actually, there is no claim. That is just a misunderstanding. And one that does not make any sense in terms of human reproductive functions. If orgasm would trigger menstruations way out of the normal cycle than successful implantation of the fertilised egg would very seldom occur and no population would exist to propagate this idea. How is a ...


7

It is debated. I found 3 studies relating to this, in temporal order: Contracept Technol Update. 1993 Oct;14(10):154-6. Researchers find no sperm in pre-ejaculate fluid. The more significant finding, however, was that most pre ejaculate samples did not contain any sperm and those that did had only small clumps of a very small amount of sperm which seemed ...


4

The woman's biorhythm cycle which is the primary basis for Smart Storks unique gender selection program is described by scientists to be pseudoscience and also an examination of 134 biorhythm studies in 1998 found that the theory is not valid.


4

Induction of labour in women with intact membranes reduces the risk of caesarean section. Per a systematic review and meta-analysis of trials in women with intact membranes in 2014 by Wood S et.al. for the question 'Does induction of labour increase the risk of caesarean section?', the authors conclude that in clinical trials of induction of labour versus ...


4

Research referred by Emily Martin in her 1991 paper 'The Egg and the Sperm: How Science Has Constructed a Romance Based on Stereotypical Male Female Roles' show that the sperm and egg are mutually active partners who do interact on more mutual terms. There is a take 2 for the egg and the sperm tale coming up with Richard Cone according to her CV present here....


4

This pubmed abstract: http://www.ncbi.nlm.nih.gov/pubmed/20102446 seems to indicate that there is a relationship between bicycle riding and erectile dysfunction through perineal compression. This abstract is from a literature review and indicates more research is needed. This study indicates that all seats lead to a decrease in penile oxygen pressure: http:/...


3

The idea that a man contributed the seed and a woman was a "container" was prevalent in the ancient world, as it has been noted above. It's even part of Apollo's main argument in the final play of the Oresteia trilogy from 458BCE. However, like now, there was not one single theory to describe nature that everyone believed. The Hippocratic Treatises ...


3

You mentioned in your comment that the sperm is healthier. If anything, ejaculation prior to sex will get rid of the old sperm and give the newer, healthier sperm more of a chance. Anyways, the health of a sperm cell really doesn't matter. First thing, all the sperm does is transfer the DNA to the egg, nothing else. DNA doesn't change for a single cell over ...


2

It seems legit. LiveStrong and the BBC both reference a 2009 Cordoba study. I believe those are talking about "Sperm morphology normalcy is inversely correlated to cycling kilometers in elite triathletes" which concludes: The main finding of the present study is that cycling training volume inversely correlates to sperm morphology. That is, athletes ...


2

In humans, the X-bearing sperm has 2.8% more total DNA than Y-bearing sperm. Thus, when stained with a DNA-specific fluorochrome, the fluorescent signal emitted by an X-bearing sperm is greater than that emitted by a Y-bearing sperm which is utilized in the Microsort method for gender selection. Male conceptuses are less viable than female and the ratio of ...


1

Sperm are intricately adapted to existing alongside millions of their peers at all times, but is simply unknown if they can survive and achieve success without these peers. There simply is not enough research to know. Specifically, no one has ever tried a series of billions of trials in which they introduced a single sperm and checked if it created a ...


1

This remains a controversial issue but the evidence doesn't appear to be strong enough to conclude there is a significant decline NB I'm adding this answer because of two contradictory papers I stumbled across in recent months that illustrate just how divided the actual evidence base is and also how the stories that hit the headlines are not an unbiased ...


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