Steven Jones, retired professor of physics at BYU
"It looks like thermite with sulfur added, which really is a very clever idea." ...video showed a yellow, molten substance splashing off the side of the south Trade Tower. Government investigators ruled out the possibility of melting steel... because of the unlikelihood of steel melting. The investigators said the molten material must have been aluminum from the plane. But molten aluminum is silvery. It never turns yellow. The substance observed in the videos "just isn't aluminum," he said. But, he said, thermite can cause steel to melt and become yellowish.
Another item of evidence, Jones said, is the fact that sulfur traces were found in structural steel recovered from the Trade Towers. Jones quoted the New York Times as saying sulfidization in the recovered steel was "perhaps the deepest mystery uncovered in the (official) investigation." But, he said, sulfidization fits the theory that sulfur was combined with thermite to make the thermite burn even hotter...
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