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.”
Cook all but confirmed that Apple is about to reveal its newest MacBooks in the coming days. His tweet features a short video of someone shaping an Apple logo on a surface that appears to have the company’s classic space gray colorway.
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"Of course, there were no women astronauts back then. But I just thought, I'll be a lady astronaut."