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The nine-year-old body of 9/11 conspiracy theories includes many improbable (and sometimes contradictory) claims, everything from remote-controlled planes flying into the World Trade Center, to a missile hitting the Pentagon, to mass kidnappings of air passengers.
But a group of more than 1,200 architects and engineers is building what it hopes is a scientifically sound argument about one 9/11 claim: That the World Trade Center buildings were destroyed not by fires caused by the airplane collisions, but by a controlled demolition.
At a press conference in Washington DC, Thursday, the gro