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52 cards in a deck
A standard deck of playing cards contains 52 cards divided into 4 suits of 13 each. The number 52 matches the weeks in a year — possibly not a coincidence. The modern deck took shape in 15th-century France.
Culture
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52 weeks in a year
A year contains 52 full weeks plus 1–2 extra days. This ratio defines the rhythm of business calendars, work cycles, and planning worldwide. 52 × 7 = 364 — almost exactly a year.
Dates
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52 Earths in the DC Multiverse
In DC Comics after 'Infinite Crisis' (2005–2006), the universe was rebooted into exactly 52 parallel Earths. The weekly series '52' (2006–2007) was a groundbreaking weekly comic book.
Culture