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Not just molten metal, there was molten concrete!

Thermite is a second alternative story which does not explain all of the anomalies on 911.

All of the effects, including never before seen 90nm dust, glowing metal in free air 10 days after the event and steel burning 8 weeks later, round holes in glass, etc. etc. are explained by Charge Clusters directed by microwaves.

https://steemit.com/conspiracy/@homosymbion/911-and-lenr-where-unicorns-sleep#