Health experts are warning people not do to the boiling water challenge. As a polar vortex sent temperatures plunging below zero last week, a challenge went viral that features people throwing boiling water in the air and watching it freeze instantly. Hospitals in the region say the challenge is sending people to the emergency room. A spokeswoman for Chicago's Loyola University Medical Center says eight people who took part in the challenge have been treated at their burn center. Burn victims have also been reported in Minneapolis and Iowa City. Officials say some the victims have been spectators watching the stunt.
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