A paper published a year earlier than Active Thermitic Material Discovered showed that metal-rich spheroids in WTC dust had iron-to-oxygen ratios indicating abundant elemental iron, such as found in thermite residues. It also pointed out several other features of WTC remains that indicated exposure to temperatures far above what could be produced by fires burning jet fuel and office contents, including: iron-rich and silicate spherules, volatilized lead, a molybdenum spherule, and materials with a "Swiss-cheese appearance". [ 22 ] Molybdenum has a very high melting point of 2617ºC.
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