Fukushima reactor No. 4 vulnerable to catastrophic collapse; could unleash 85 times Cesium-137 radiation of Chernobyl; human civilization on the brink

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Over a year on from the initial incident. Much appears, still unknown  ?.
Can the theories, predict accurately, all the possible outcomes ?.

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Fukushima reactor No. 4 vulnerable to catastrophic collapse; could unleash 85 times Cesium-137 radiation of Chernobyl; human civilization on the brink