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The master builder number
22 is the second master number in numerology, the 'master builder'. It has the energy of manifesting great ideas into reality. The Fool card in Tarot is 0, and there are 22 Major Arcana cards in total.
Numerology
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Joseph Heller's 'Catch-22'
Joseph Heller's novel 'Catch-22' (1961) is one of the most important books of the 20th century about WWII and bureaucratic absurdity. The phrase 'catch-22' entered most world languages as a synonym for a logical trap.
Culture
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22/7 — approximation of π
The fraction 22/7 = 3.142857... is one of the most famous rational approximations of π, used since Archimedes. The error is less than 0.04%.
Science