A lingering technical question about the Sept. 11 terrorist attacks still haunts some, and it has political implications: How did 200,000 tons of steel disintegrate and drop in 11 seconds? A thousand architects and engineers want to know, and are calling on Congress to order a new investigation into the destruction of the Twin Towers and Building 7 at the World Trade Center. In order to bring down this kind of mass in such a short period of time, the material must have been artificially, exploded outwards," says Richard Gage, a San Francisco architect and founder of the nonprofit Architects & Engineers for 9/11 Truth. Mr. Gage, who is a member of the American Institute of Architects, managed to persuade more than 1,000 of his peers to sign a new petition requesting a formal inquiry. "The official Federal Emergency Management [Agency] and National Institute of Standards and Technology reports provide insufficient, contradictory and fraudulent accounts of the circumstances of the towers' destruction. We are therefore calling for a grand jury investigation of NIST officials," Mr. Gage adds. "The implications are enormous."