Delving into mythic and historical enigmas were authors William Henry & Laurence Gardner who made a joint appearance on Tuesday night's show. Among the topics discussed was the Holy Grail which "has many attributes," said Gardner, explaining that it wasn't just a particular physical object, but a concept that represented the "ultimate quest."

William Henry expounded on the Blue Stones, which he believes the "stargate" gods of Sumeria once possessed. These stones, he suggested, could have transformative powers, altering humans so they would be capable of traveling through a stargate or wormhole. Possible evidence of these stones was gleaned on their recent Holy Grail Pilgrimage in France, where Henry said he saw Egyptian mummy cases at the Louvre that had blue stones attached.

A corollary to the stones is the "white powder," a substance derived from gold, which Laurence has been studying. Lore about it dates back to the earliest times, yet it is currently being experimented with for nuclear and astrophysics applications, Gardner said. It's also said to possess anti-aging properties and Gardner revealed that he has recently begun to ingest it. The website subtleenergies.com has information on one variant of this powder.