Remembering Chernobyl

Candles and flowers are placed to commemorate those who died after the Chernobyl nuclear disaster, during a ceremony at the memorial to Chernobyl firefighters in the city of Slavutich, Ukraine, Tuesday.. Former Soviet republics marked 25 years Tuesday 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/Efrem Lukatsky)