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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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第三节 侵犯人身权利、财产权利的行为和处罚
A 38-year-old man has been arrested after the statue of Winston Churchill outside the Houses of Parliament was defaced with graffiti calling the former prime minister a “Zionist war criminal”.
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