Great mysteries

Surveys the field of computers and artificial intelligence and presents opposing viewpoints on the matter of creating intelligent machines.

Describes supposedly true incidents in which houses have been haunted, in such categories as "Friendly Ghosts, " "Animal Ghosts, " and "Vengeful Ghosts.".

Discusses historical, philosophical, and scientific theories about the mysterious origins of human language.

Examines the evidence of communication between animals and the possibilities of communication between animals and humans.

Examines the mystery surrounding the building of the Egyptian pyramids incorporating expert opinions and popular theories.

Examines several issues related to witches, including what happened in Salem and whether witches really fly, and incorporates the opposing views of experts.

Describes the characteristics of poltergeists and their behavior and examines the controversy surrounding their existence.

Discusses possible reasons for the extinction of the dinosaurs.

Examines the arguments for and against alternative healing methods such as psychic and natural healing, self-healing, and faith healing.

Presents the legends of the lost lands of Atlantis, Camelot, Lemuria, Babylon, Lyonesse, El Dorado, and Mu.