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.”
Андрей Ставицкий (Редактор отдела «Наука и техника»)
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"Not because I felt pressure from my fans, they're very respectful, but I don't want to be sidelined - and I think that's very easy to do when you have a lack of visual identity, which I definitely did have earlier in my career.
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