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Humanity's favorite 'random' number
Psychologists have found: when people are asked to name a random number from 1 to 20, most choose 17. This prime number seems most 'random' and 'unpredictable' due to its asymmetry.
Numerology
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1917 — year of two revolutions in Russia
1917 was one of the most pivotal years in human history: the February Revolution overthrew the Tsar, the October Revolution established Soviet power. These events changed the course of the 20th century.
History
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Seventeen — Korean group with 13 members
SEVENTEEN — one of the biggest K-pop groups, despite the name, the group has 13 members. The name is explained by the formula: 13 members + 3 subgroups + 1 team = 17.
Culture