ASSOCIATED PRESS PHOTOGRAPHS On the 25th anniversary of the nuclear disaster at Chernobyl, Vera Toptunova mourns at the Moscow grave of her son Leonid, a senior control engineer at Reactor No.4 when it exploded April 26, 1986. "It's of utmost importance that we understand what kind of force humankind is dealing with so that our solutions meet the challenges of nuclear energy," Russian President Dmitry Medvedev said.
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