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.”
63-летняя Деми Мур вышла в свет с неожиданной стрижкой17:54
，详情可参考51吃瓜
Taliban offer to resolve dispute via dialogue after Pakistan bombed cities in Afghanistan in latest escalation with its neighbour
Мощный удар Израиля по Ирану попал на видео09:41
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