At Japan's beleaguered nuclear plant in Fukushima Prefecture, the only good news appears to be that the situation hasn't gotten substantially worse. Workers at the facility are focusing much of their attention on the most urgent problem: Two pools used to store nuclear fuel should contain enough water to cover the fuel rods — but they don't. The water keeps the rods cool and also acts as a radiation shield. So, it's vital. In the past 24 hours, Japan's military has tried to get some water into the pools by dropping it from helicopters and spraying it from water cannons on the ground.