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Published on May 13, 2007
BYU physicist Professor Steven Jones told peers at a Utah meeting that, "while almost no fire, even one ignited by jet fuel, can cause structural steel to fail, the combination of thermite and sulfur "slices through steel like a hot knife through butter."
Jones points to this video which shows a bright yellow molten substance dripping from the south tower minutes before its collapse. Government investigators claimed that this was aluminum from Flight 175 but Jones is adamant that aluminum is silvery in appearance and doesn't turn yellow.
Jones also told the media that sulfur traces found at ground zero indicates the thermite was combined with sulphur to make it burn even hotter than the normal 2500 degrees Celsius.
Jones stated that thermite was a "clever" choice because its ingredients, aluminum and iron oxide do not require identifying tags by law, meaning they couldn't be traced back to their manufacturers.