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Helicopters and fire trucks proved unsuccessful at replenishing damaged nuclear fuel pools at Japan's Fukushima Daiichi plant on Thursday. The spent-fuel pools contain a large amount of radioactive material that is not contained as well as that in the reactor cores. And although information has been spotty, nuclear experts worry that this fuel--which should be submerged in circulating water to keep it from overheating--has been at least partly exposed in the pools belonging to reactors Nos.

First came the earthquake , centered just off the east coast of Japan, near Honshu. The horror of the tsunami quickly followed