At the Los Alamos National Laboratory in New Mexico, workers are still waiting for answers about who is liable for sicknesses they say were caused by radiation from the lab.
Valery N. Bliznyuk was a young physicist in Kiev 25 years ago during the Chernobyl disaster. His recollections of the slow spread of accurate information about what was really happening suggest parallels with the current nuclear crisis in Japan.
Ecologist Nick Haddad discusses his massive experiment in creating habitat corridors on lands protected because they surround guarded nuclear sites.
Human error helped worsen a nuclear meltdown just outside Los Angeles, and now human inertia has stymied the radioactive cleanup for half a century.