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Silver jubilee — 25 years
The 25th anniversary in most cultures is celebrated as a silver jubilee — silver wedding, silver company anniversary. 25 years is considered a quarter century, an important life milestone.
Culture
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25 = 5² — square of five
25 is the perfect square of 5 (5×5=25). In SI units: 25°C is comfortable room temperature. It appears naturally in many mathematical and physical constants.
Science
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Article 25 of the Universal Declaration of Human Rights
Article 25 of the UDHR (1948) enshrines everyone's right to an adequate standard of living, including food, housing and medical care. It is considered one of the most important articles of the document.
History