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Michael Jordan's number
Michael Jordan wore number 23 for the Chicago Bulls and made it the most famous sports number in history. Number 23 has been retired by most teams where Jordan played.
Culture
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The 23 enigma
The '23 enigma' is the belief that most significant events are connected to the number 23. Described in Robert Wilson's novel. Psychologists explain this as apophenia — the brain's tendency to find patterns.
Numerology
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23 pairs of chromosomes in humans
The human genome contains exactly 23 pairs of chromosomes — 46 chromosomes in total. The 23rd pair determines sex: XX — female, XY — male. This fact was discovered in 1956.
Science