Falk didn’t touch on the controversy until the end of the lecture. One man professed his disbelief at the accepted 9/11 story and asked Falk if he believed the official version of events. Falk chuckled. “I was waiting for the question,” he said. Falk responded by explaining he didn’t have the necessary knowledge to answer the question but said he felt there was enough “existential doubt” to re-examine the incident. “It can’t be dismissed by calling anyone who says there are some unanswered questions a conspiracy theorist,” Falk said.