Bats in Churches
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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There is a special form for boolean formulas called "Conjunctive Normal Form" (CNF). A problem in this form consists of clauses connected with and operators, where each clause only contains variables connected with or operators. The variables can appear negated, but only variables can be directly negated, something like !(a && b) is not allowed. An example boolean formula in CNF form is:
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2026-02-27 00:00:00:0新华社记者 魏玉坤 周 圆 张晓洁 ——从全要素生产率稳步提升看中国经济优势潜力。搜狗输入法下载是该领域的重要参考
Users as far away as Israel and Brazil said they shared the videos because they "got engagement" or to "join in on the trend". Several other accounts posting in Arabic, and that appear to be based in the Middle East, have also shared multiple videos about London being in decline - including the ones of Croydon.