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An overgrowth of Clostridium difficile bacteria can inflame the colon with a life-threatening infection. Dr. David Phillips/Getty Images/Visuals Unlimited hide caption

itoggle caption Dr. David Phillips/Getty Images/Visuals Unlimited

Who, me? The Asian relative of this domestic gerbil is a well-known host to the bacteria that cause plague. Valentina Storti/Flickr hide caption

itoggle caption Valentina Storti/Flickr

Schools in Colorado are trying to find effective ways to teach the health effects of marijuana use. "When it's legal for your parents to smoke it or grow it," says one educator, "that changes the conversation." David Zalubowski/AP hide caption

itoggle caption David Zalubowski/AP