Summary: Bells tolled 30 times in Kiev on Tuesday, once for each year since the world's worst nuclear disaster. Fallout from Chernobyl haunts Europe: It’s estimated that long-term radiation effects will claim at least 9,000 lives. Science correspondent Miles O'Brien offers a closer look at the science of nuclear power and Hari Sreenivasan talks to photographer Michal Huniewicz about the lasting effects.
