Enigma 532: Friday the 13th
30 December 2019
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From New Scientist #1684, 30th September 1989 [link]
John Thomas, who is 50 this year [i.e. in 1989], was not really superstitious till Betty left him. In fact, they were engaged on a Friday the 13th. They were married after 13 weeks of courtship on a Friday the 13th. The married couple were abroad for their Christmas vacation. Towards the end of that vacation they quarrelled and disagreed on almost everything. They were eventually separated on a Friday the 13th, after exactly 13 weeks of married life. These events made John very, very superstitious.
When did Betty leave John?