our guest tonight here at the top of the show is alice hoagland, alice hoagland's son died in shanksville, pennsylvania, on september 11, 2001, since her son was killed, she has taken it upon herself to talk face-to-face to people who believe in the 9/11 conspiracies. she met several of them in shanksville for a bbc documentary. >> began to be surreal right away. i answered the phone and i heard mark's voice. mom, this is mark bingham. >> he had to introduce himself? >> on occasion, and people have made quite a to do about that. one of the persistent rumors is that what i heard was a computer-generated voice that no son would call up his mother and say, mom, this is mark bingham. i was puzzling about it, but i realized he was a public relations man, he was used to talking to people by introducing himself on the phone, hello, this is mark bingham. it was what came out of his mouth when he was trying hard to be calm and composed and talk to his mom. >> i don't think there's anything suspicious about him saying his full name. >> no. >> is there any doubt in your mind it was your boy you were