Molten aluminum from the aircraft hulls mixed with water from the sprinkler systems at the World Trade center could be responsible for the collapse of the twin towers, according to a study by Christian Simensen, a scientist at SINTEF, a Norwegian research institute. He said the two jets that flew into the buildings were "trapped inside an insulating layer of building debris," which caused the heat to rise, melting tons of aluminum. When hot aluminum mixes with water, explosions occur. To prevent similar explosions, "We could develop means of rapidly emptying sprinkler systems in the floors beneath the point of impact," said Simensen.

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