These twins start sibling rivalry by fighting in the womb12/3/2012
A study at London's Center for Fetal Care has produced raw but clear MRI video images of sibs in utero kicking and struggling for real estate in Mom's belly. It's all to learn more about twin-to-twin transfusion syndrome, in which one fetus takes blood from the other and can cause brain injuries and stunted growth. And if the video doesn't allow us to hear what's going on in there, we can imagine: "Mom, he's touching me! Mom, tell her to stop! Mom!" [Source]
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Does your family have a sibling rivalry?