On National Sibling Day, Celebrate the Relative Chillness of Human Rivalry

Brothers and sisters are supposed to show appreciation for one another on National Sibling Day, though whether you’ll actually exchange any outpourings of affection totally depends on whether you like each other or not. While there are plenty of studies outlining the psychological benefits of their constant companionship, the effects of sibling relationships gone awry can persist throughout a lifetime.

Sibling rivalry is commonly observed throughout the animal kingdom: When resources and...

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