How could he have possibly known?
He didn't , he talked you into believing he did, simple magician's technique, you can see how it's done here,
http://www.youtube.com/watch?v=U8EqdUYqlpY
Note too how the man whose reading was tape recorded still believes despite the clear evidence of the vagueness of the reading in the transcript.
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Parents of young, organic life forms are warned that towels can be harmful if swallowed in large quantities.
