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The University of Virginia is trying to crack down on excessive and underage drinking at fraternities. Jay Paul/Getty Images hide caption

itoggle caption Jay Paul/Getty Images

An X-ray of the chest of a man with tuberculosis. The areas infected with TB bacteria are colored red. Science Photo Library/Corbis hide caption

itoggle caption Science Photo Library/Corbis

People with severe allergies often carry an epinephrine pen to stop life-threatening reactions. But emergency room doctors may not know that's the best treatment. Paul Rapson/Science Source hide caption

itoggle caption Paul Rapson/Science Source

Medical residents including Dr. Amy Ho (bottom right) helped with first aid at the Pitchfork Music Festival in Chicago. Courtesy Amy Ho hide caption

itoggle caption Courtesy Amy Ho