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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The research, using data from more than 1.8 million people who were tracked over many years, found that vegetarians had a 21% lower risk of pancreatic cancer, a 12% lower risk of prostate cancer and a 9% lower risk of breast cancer compared with meat eaters. Combined, these cancers account for around a fifth of cancer deaths in the UK.。关于这个话题，旺商聊官方下载提供了深入分析
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