Today, Friday the 13th, our summer-minded readers may be interested to know that triskaidekaphobia has received some serious attention in the medical literature over the past twenty years. A search for ‘Friday 13th’ in PubMed reveals that as much as ten articles have been written so far, including three in the British Medical journal, and two in The American Journal of Psychiatry. The results do not seem to be conclusive, however.

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