What Could Possibly Go Wrong?

In Japan, an explosion at a nuclear power station tore down the walls of one building. Japanese officials said they feared the reactor could melt down following the failure of its cooling system in the earthquake and tsunami.

It was not clear if the damaged building housed the reactor. Tokyo Power Electric Co., the utility that runs the Fukushima Dai-ichi plant, said four workers were injured but details were not immediately available.

It could always get worse, and has: