Woman lights candles to honor the memory of the victims of the Chernobyl disaster in Kiev, Ukraine, early Tuesday, April 26, 2011. Ukraine marked the 25th anniversary since the Chernobyl power station exploded in the world's worst nuclear accident, endangering hundreds of thousands of lives and contaminating pristine forests and farmland. (AP Photo/Sergei Chuzavkov)
A woman lights candles to honor the memory of the victims of the Chernobyl disaster in Kiev, Ukraine, early Tuesday. Ukraine marks the 25th anniversary on April 26 since the Chernobyl power station exploded in the world's worst nuclear accident, endangering hundreds of thousands of lives and contaminating pristine forests and farmland.