How much does psychology come into play when it comes to the day a woman gives birth? As it turns out, more than what you might expect. Using 11-years' worth of U.S. birth certificate data provided by the National Center for Health Statistics, Yale researchers have found that there are higher instances of birth on Valentine's Day, a holiday traditionally linked with positive symbolism, while Halloween — a holiday which traditionally conveys negative symbolism — has lowered birth rates. Take a look at the following graphs, provided by Try Nerdy:       While the overall increased likelihood of giving birth on Valentine's Day jumps by 5%, a whopping 11.3% decrease in births was seen on Halloween across these years! Although I know quite a few women who say that...