A 1950 FBI memo mentions a crashed UFO saucer and alien bodies -- but it is real? Yes and no. ->
Venezuela's president Hugo Chavez died last week from cancer, though some suspect he may have been assassinated. ->
In the months and years after the Apollo 1 fire, stories surfaced that the crew had been victims of murder. ->
In a surprising twist, al-Qaeda issued a statement ridiculing 9/11 conspiracy theories claiming U.S. involvement in the attacks.
Why have conspiracy theories about Obama's nationality endured?
Why is Denver International Airport a hub of conspiracy theories and 2012 doomsday predictions?