Image Credit: Sausly. Federica Mercuriello.
The “Knocking on Wood” Wikipedia page mentions Roud’s conclusion, and this claim of a 19th century origin has circulated online as the final say on the matter. If you go back to the original, though, Roud’s proposal actually ends on an ambivalent note: “Before this theory [of 19th century origins] can be finally accepted, however, an examination of the history of European forms of this custom would be advisable.”
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Here are the clues and answers to NYT's The Mini for Thursday, Feb. 26, 2026:
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// 步骤4：当前索引入栈 → 作为前面位置（i-1、i-2等）的"参考身高"。WPS下载最新地址是该领域的重要参考