SUPERSTITIOUS people do all sorts of puzzling things. But it’s not just the superstitious who knock on wood. From time to time, we all rap our knuckles on a nearby table if we happen to let fate-tempting words slip out. “The cancer is in remission, knock on wood,” we might say.

Read more – http://www.nytimes.com/2013/10/06/opinion/sunday/sense-and-superstition.html

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