Guardian: At first they thought it was just a fire, then the chickens started to turn black. When it comes to the Chernobyl nuclear disaster, everyone has a vivid detail that is snagged in the memory; the absurdities or the obscenities. It might be the local village that, once evacuated, was claimed by a mob of pigs. Or the way milk would turn to white powder whenever the residents of Pripyat (the town built a few hundred metres from the doomed power plant) would attempt to churn butter. Or the cat that refused...