Can you guess which eyes belong to what animal? Top row, from left: cuttlefish, lion, goat. Bottom row, from left: domestic cat, horse, gecko. Top row: iStockphoto; bottom row: Flickr hide caption

itoggle caption Top row: iStockphoto; bottom row: Flickr

Workers for the Safe Streets violence interruption project including Gardnel Carter, center, talk with Baltimore residents in 2010. Kenneth K. Lam/MCT via Getty Images hide caption

itoggle caption Kenneth K. Lam/MCT via Getty Images

Nursing attendant Tracie Bell helps manage patients at the ophthalmology clinic at Los Angeles County Harbor-UCLA Medical Center. The clinic created a color-coded system to reduce wait times for patients. Anna Gorman/Kaiser Health News hide caption

itoggle caption Anna Gorman/Kaiser Health News

The Clinton campaign's debate watch war room was actually just a conference room with a big-screen TV at the front. Fifteen or so staffers huddled over their laptops ready to pounce. Tamara Keith/NPR hide caption

itoggle caption Tamara Keith/NPR

Ashamoni, wife of blogger Niloy Chakrabati, cries at her house in Dhaka, Bangladesh, on Friday after her secular activist husband was hacked to death by suspected Islamist extremists. A.M. Ahad/AP hide caption

itoggle caption A.M. Ahad/AP

Visitors look at a miniature map of the Korean Peninsula at the Odusan observatory in Paju, Gyeonggi-do, South Korea, on Friday. North Korea is set to push back its clocks by half an hour to mark the end of Japanese occupation after World War II. Jeon Heon-Kyun/EPA/Landov hide caption

itoggle caption Jeon Heon-Kyun/EPA/Landov