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:
Established in 1951 by Hartwig's grandfather Floyd, Twig's signature product is Sun Drop, a citrus-flavoured soft drink developed in 1940s Missouri.
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В Финляндии предупредили об опасном шаге ЕС против России09:28。关于这个话题，heLLoword翻译官方下载提供了深入分析
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