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.
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Москвичам рассказали о погоде в начале весныСиноптик Тишковец: В первый день весны в Москве ожидаются дожди
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Source: Computational Materials Science, Volume 266