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May I suggest that the bias is due to the majority of dowsers using some sort of hand manipulation with their right hand.
If viewing the figures with the "A4" square in the upper right hand corner as presented on the webpages, I would think a right hand bias would be natural for selections made with a right hand manipulation.
Alternately, picking a square at random (no physical manipulation) would result in no bias.
I'm sure there may be physiologists that might be able to confirm or deny my theory.
Too bad we didn't get more entries.
Something is not right. This message is just to keep things from messing up down the road