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  • Aurélie Marrier d'Unienville
    Siblings — especially twins — sometimes share the strangest traits, like throwing a ball with their head or picking up keys and crayons with their toes. Researchers want to know what's up with that.
  • Douglas Sacha
    /
    Getty Images
    For decades, nonprofits, health insurers and hospitals have been trying to solve the problem of the people who need the emergency room again and again. Here are some of the lessons they've learned.