Todd is joined by Rodney Cluff, author of "World Top Secret: Our Earth IS Hollow!"

Todd is joined this week on the show by Larry Arnold, founder of ParaScience International.

Arnold was trained in the methodology of science with an undergraduate major in mechanical engineering. He later worked for the private-sector in electrical engineering. Larry developed a burgeoning fascination with human consciousness potential and undertook a new province of study: the unexplained.

In 1976 he founded ParaScience International. As director of PSI, he combines his scientific background with investigating and describing the intriguing world of forteana - those unconventional subjects and weird events that fail to find acceptance, let alone explanation, within the boundaries of today's science. Arnold is internationally recognized for his pioneering research in spontaneous human combustion.

Arnold has also been a featured guest on Coast-to-Coast with George Noory.

Gary A. David is an author and independent researcher who studies the archaeological ruins and rock art.

In 2006 after more than a decade of fieldwork and scholarly inquiry, his nonfiction book The Orion Zone: Ancient Star Cites of the American Southwest was published. This volume describes a pattern of Hopi villages and ruin sites that precisely mirrors Orion, with an ancient site corresponding to each major star in the constellation.