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“No one wants to read a 7-inch-long unformatted message when an organized attachment would have worked better,” the American etiquette experts at The Emily Post Institute, advised in a blog post on business communications.
What we see is that there are in fact two entangled traditions of “knocking on things for good luck”: touching iron, and touching wood. We also find that they are widely distributed, but also have a pretty clear cluster around the Mediterranean and Europe.