As we pass the 25th anniversary of the 911 terror attacks, Claus Larsen and Steen Svanholm take a look at some of the most prominent conspiracy theories surrounding them, and discuss why many of them still persist a quarter of a century later.

Claus Larsen has an IT-background, has been a skeptic for many years, and is an internationally recognized writer, e.g. for Skeptica, the network of independent skeptics in Denmark. Claus Larsen lived and was present in New York on September 11th 2001.

Steen Svanholm is a certified teacher and a part time musician and writer. He has noted that conspiracy theories are especially popular with artists. His guess is that artists are used to having a professionally naive open mindedness about the world as such. While great for artistic expression, it is bad for understanding reality.