In this illustration, new viruses emerge from an infected human throat cell. When you get the flu, viruses turn your cells into tiny virus factories that help spread the disease. Courtesy XVIVO/Zirus hide caption

itoggle caption Courtesy XVIVO/Zirus

A sexton beetle buries a recently deceased shrew. Image courtesy of Fabricator of Useless Articles hide caption

itoggle caption Image courtesy of Fabricator of Useless Articles