How did the Oracle at Delphi really prophesize?

The Archaeology News Network: How did the Oracle at Delphi really prophesize?: "The Oracle at Delphi is referenced throughout Greek myths and history. Supposedly she was rendered psychic by Apollo. Practically, she was off her skull on gas that seeped out of the fissures of the temple in which she lived. Here is the scientific explanation for what caused this woman to utter her confused prophecies."