A British mathematician has revealed a surprising sex 'hack' that could make women who get pregnant more likely to give birth to a boy.
Professor Hannah Fry took to Instagram to discuss a peculiar trend, which involves a spike in baby boys being born after world wars have ended, known as the 'the returning soldier effect'.
Pointing to graph showing the ratio of baby boys and girls born in England and Wales she explained: 'You've got some really definite peaks — one in 1919 just after the end of the , another one in 1945 just after the end of the '.
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