View of the sarcophagus covering the damaged Reactor No. 4 of the Chernobyl nuclear power plant on April 12, 2006, nearly 20 years after the 1986 explosion spewed radioactive clouds over the western part of the then-Soviet Union and much of Europe. Ukraine marks the 20th anniversary of the Chernobyl nuclear disaster on April 26, 2006. The explosion was the world's worst-ever nuclear accident.
(Photo: Getty Images/AFP/Genia Savilov)
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