Throughout the history of mankind, the war has changed society in both the expected and unexpected way. Economics are changing, political landscapes evolve, cultural norms are corresponding. But behind these large -scale changes, an unusual biological trend is hidden, which seems to be not amenable to explanation. After large conflicts, a barely noticeable, but statistically significant increase in the number of births of men is recorded - this pattern is known as the "

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Some people explain this surge in fate or divine intervention, but science offers many intriguing explanations. For the first time, this phenomenon was recorded in the 1950s by researchers Mcamahon and drinking, but it appeared especially vividly after the Second World War, when the percentage of men's births in the United States grew from 51.406% to 51.48%. Although the increase was insignificant, it was observed in many countries, which suggests the presence of a wider biological mechanism underlying this phenomenon.

Considering that in the natural ratio of genders at birth, preference is given to men, probably as compensation for the higher mortality of men's infants, this unexpected surge in the birth rate of men after the war remains an interesting topic for scientists. Attempts to explain this effect led to the emergence of competing theories.

One of the hypotheses suggests that higher soldiers had more chances to survive in battle and that high parents are statistically more prone to the birth of sons. The study published in the journal Human Reproduction and dedicated to the soldiers of the First World War showed that the average growth of those who survived was slightly higher (168.63 cm) than those who died (166.26 cm). In addition, the data of national longitudinal research of adolescents revealed a correlation between the growth of parents and the higher probability of the birth of male offspring. Although this theory is intriguing, it has little biological and genetic substantiation of why growth can play a role both in survival and in the choice of gender.

Another theory, known as the " When men went to war, women often entered into traditionally male roles, occupying physically hard work in factories or even participating in resistance. Some believe that such changes could lead to an increase in the level of testosterone in their body, which could affect the likelihood of conception of a male child. However, scientific support for the idea that such changes in lifestyle can significantly change the hormonal background or affect the ratio of floors during conception is small.

The most plausible explanation is associated with the time of conception in relation to the menstrual cycle. The post-war increase in sexual activity, historically confirmed and called " At this stage, higher levels of estrogen and gonadotrophins, as well as slightly increased pH of the cervix can slightly favors male sperm. Although for a separate pair this effect will be insignificant, at the level of the population it can explain the observed shift in the ratio of the birth rate.

Since in modern society there is a decrease in the birth rate and a change in the reproductive model, it is still unclear whether the " Since the facts indicate that modern people lead a less active sex life than previous generations, biological forces, which once subtly regulated the ratio of sexes, may no longer function as before. Whether this will lead to long -term changes in the dynamics of the population of the Earth’s population is an open question, and only time and continuing research will give the answer to it.

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