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Visitors tour an aquarium during a media day of Expo 2012, in Yeosu, South Korea, Wednesday, May 9, 2012. The expo will open for three months on May 12 under the theme of "The Living Ocean and Coast: Diversity of Resources and Sustainable Activities." (AP Photo/Yonhap) KOREA OUT

Expo 2012: South Korea

Expo 2012 has opened in South Korea's coastal city of Yeosu for a three-month run. The fair, which kicked off Saturday, May 12, has the largest number of robots in the history of expos, including a robot fish that explores underwater resources in an environment-friendly way.