There's been plenty of research on birth order and personality traits, but did you know that siblings can affect health, happiness, intelligence, and even sexual maturity? In honor of National Sisters Day on Sunday, we're diving into some of the most fascinating findings from studies about siblings. To celebrate, call your sister, then take a look at this interesting research that covers how siblings relate to IQ scores, blood pressure, depression, and more!
What Studies Have to Say About Siblings
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