The standing ovation has finally died down, and Steven E. Jones, a soft-spoken physics professor, finds himself pinned against the stage by some of the enthusiastic fans who packed a University of Denver auditorium. Can I just shake your hand?" a woman in a baggy red sweater asks Jones. "You're doing such important work." If anything, Jones appears embarrassed by all the attention. Quiet and self-effacing, he's an unlikely hero for 9/11 conspiracy theorists of every stripe, but that's exactly what he's become. A physicist whose background includes work on nuclear fusion, Jones was put on leave by Brigham Young University in September after publishing a paper saying that the twin towers couldn't have collapsed solely as a result of the planes that rammed the upper floors on Sept. 11. The paper theorizes that explosives planted inside the building must have been involved. Though Jones doesn't specify who he believes planted the charges, he concedes it would have had to be "an inside job" and likely would have included either very powerful figures on the American scene or entities inside the government. Jones and his work reflect the mainstreaming of a movement that has defied the Bush administration's efforts to put it to rest and mystified people who have studied the events of that day closely. A startlingly large percentage of the population simply doesn't believe the official explanation. A national poll by the Scripps Survey Center at Ohio University conducted in the summer found that more than a third of people questioned believed the government either planned the attacks or could have stopped them but didn't.

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