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15 ore fa · 1921 - Paul Peter Ewald introduced a spherical construction for explaining the occurrence of diffraction spots, which is now called Ewald's sphere. [63] 1922 - Charles Galton Darwin formulated the theory of X-ray diffraction from imperfect crystals and introduced the concept of mosaicity in crystallography.
2 giorni fa · Alexander Vladimirovich " Sasha " Povetkin ( Russian: Алекса́ндр Влади́мирович Пове́ткин; born 2 September 1979) is a Russian former professional boxer who competed from 2005 to 2021. He held the World Boxing Association (WBA) ( Regular version) heavyweight title from 2011 to 2013; the World Boxing Council (WBC ...
2 giorni fa · Alexander Aleksandrovich Alekhine [a] [b] (October 31 [ O.S. October 19] 1892 – March 24, 1946) was a Russian and French chess player and the fourth World Chess Champion, a title he held for two reigns. By the age of 22, Alekhine was already among the strongest chess players in the world. During the 1920s, he won most of the tournaments in ...
3 giorni fa · Changes in medals. On 18 August 2016, Kyrgyz weightlifter Izzat Artykov was stripped of his bronze medal in the men's 69 kg event after testing positive for strychnine. Luis Javier Mosquera of Colombia, who had been the fourth-place finisher before Artykov's disqualification, was moved into third place.
4 giorni fa · Estimated to have employed over 100 scholars at its height [8] [9] The Great Library of Alexandria in Alexandria, Egypt, was one of the largest and most significant libraries of the ancient world. The library was part of a larger research institution called the Mouseion, which was dedicated to the Muses, the nine goddesses of the arts. [10]
2 giorni fa · None. Pope Alexander VI [Note 2] (born Rodrigo de Borja; [Note 3] 1 January 1431 – 18 August 1503) ( epithet: Valentinus ("The Valencian ")) [6] was head of the Catholic Church and ruler of the Papal States from 11 August 1492 until his death in 1503. Born into the prominent Borgia family in Xàtiva in the Kingdom of Valencia under the Crown ...
