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What I found is that written evidence for knocking on wood (and for the history of gesture as a whole) is remarkably sparse. In the Penguin Guide to Superstitions, folklorist Steve Roud offers a skeptical take on the provenance of knocking on wood due to the near total absence of written records about it:
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"They're lovely, but they're problematic too," says Graeme Peart from St Margaret's Church, Saxlingham, just a few miles from Guestwick.