Posted at noon, March 14: A Japanese utility says fuel rods at a troubled nuclear reactor were once again fully exposed hours after authorities were able to stabilize a similar emergency. Tokyo Electric Power Co. says the exposure happened at Unit 2 of the Fukushima Dai-ichi plant because a steam vent wouldn't open Monday, causing a sudden drop of water. That reactor and two others at the plant are dangerously overheating and authorities are racing to prevent meltdown. AP

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