Associated Press
In this undated image released by Organizing Committee Expo 2012, The Big-O, a giant structure that will display hologram images, stands out from the water in the southern coastal city of Yeosu where South Korea is preparing to open Expo 2012 on May 12. The expo has a theme of oceans and sustainability, with an emphasis on technology. The event is expected to attract millions of visitors from around the world during its three-month run. (AP Photo/Organizing Committee Expo 2012)

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