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Then again, maybe it all really does go back to Tiggy-Touch-Wood. The truth is that we really do know shockingly little about the history of gesture.
"I could carry a meeting without any problems; but then I'd be sat there, not knowing what the name of something was that I've known for years, then you're embarrassed, then the hot flushes come and the anxiety and overwhelm and it was just all too much.