it’s uncertain exactly when this particular tradition began
Why do western cultures have historically associated the number 12 with completeness?
There are 12 days of Christmas, 12 months and zodiac signs, 12 labors of Hercules, 12 gods of Olympus and 12 tribes of Israel, just to name a few examples.
Why has Friday always been considered an unlucky day?
Because Friday was the day of the crucifixion, Fridays were always regarded as a day of penance and abstinence.
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