Expo 2012: South Korea S. Korea expo draws tens of thousands on first day. AFP Fireworks light the sky for the opening ceremony of the 201...

Expo 2012: South Korea

S. Korea expo draws tens of thousands on first day. AFP

Fireworks light the sky for the opening ceremony of the 2012 Yeosu Expo on May 11, 2012 in Yeosu, South Korea. More than 105 countries, 10 International Organizations and 10 million visitors are expected to participate in the expo that will open to the public on May 12 to August 12. (Photo by Chung Sung-Jun/Getty Images)

Flag bearers hold national flags during the opening ceremony of the 2012 Yeosu Expo on May 11, 2012 in Yeosu, South Korea. More than 105 countries, 10 International Organizations and 10 million visitors are expected to participate in the expo that will open to the public on May 12 to August 12. (Photo by Chung Sung-Jun/Getty Images)

South Korean President Lee Myung-Bak speaks at the opening ceremony of the 2012 Yeosu Expo on May 11, 2012 in Yeosu, South Korea. More than 105 countries, 10 International Organizations and 10 million visitors are expected to participate in the expo that will open to the public on May 12 to August 12. (Photo by Chung Sung-Jun/Getty Images)

Flag bearers hold national flags during the opening ceremony of the 2012 Yeosu Expo on May 11, 2012 in Yeosu, South Korea. More than 105 countries, 10 International Organizations and 10 million visitors are expected to participate in the expo that will open to the public on May 12 to August 12. (Photo by Chung Sung-Jun/Getty Images)

Fireworks explode during the opening ceremony for the 2012 Yeosu Expo in Yeosu, about 460 km (286 miles) south of Seoul May 11, 2012. The Yeosu Expo will last until August 12 and its theme is "The Living Ocean and Coast". REUTERS

South Koreans perform during the opening ceremony of the 2012 Yeosu Expo on May 11, 2012 in Yeosu, South Korea. More than 105 countries, 10 International Organizations and 10 million visitors are expected to participate in the expo that will open to the public on May 12 to August 12. (Photo by Chung Sung-Jun/Getty Images)

The seafront site of the 2012 Expo is seen in Yeosu, a small city on South Korea's south coast, on May 9, 2012

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.