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21 小時前 · Unit 731 (Japanese: 731部隊, Hepburn: Nana-san-ichi Butai), short for Manchu Detachment 731 and also known as the Kamo Detachment: 198 and the Ishii Unit, was a covert biological and chemical warfare research and development unit of the Imperial Japanese Army that engaged in lethal human experimentation and biological weapons manufacturing during the Second Sino-Japanese War (1937–1945 ...
3 天前 · On January 28, 1986, the Space Shuttle Challenger broke apart 73 seconds into its flight, killing all seven crew members aboard. The spacecraft disintegrated 46,000 feet (14 km) above the Atlantic Ocean, off the coast of Cape Canaveral, Florida, at 11:39 a.m. EST (16:39 UTC ). It was the first fatal accident involving an American spacecraft ...
5 天前 · Danube is an Old European river name derived from the Celtic ' danu ' or ' don ' [17] (both Celtic gods), which itself derived from the Proto-Indo-European *deh₂nu. Other European river names from the same root include the Dunaj, Dzvina/ Daugava, Don, Donets, Dnieper, Dniestr, Dysna and Tana/Deatnu. In Rigvedic Sanskrit, danu (दनु ...
1 天前 · The term convolution refers to both the result function and to the process of computing it. It is defined as the integral of the product of the two functions after one is reflected about the y-axis and shifted. The integral is evaluated for all values of shift, producing the convolution function.
2 天前 · Johann Sebastian Bach [n 1] (31 March [ O.S. 21 March] 1685 – 28 July 1750) was a German composer and musician of the late Baroque period. He is known for his prolific authorship of music across a variety of instruments and forms, including; orchestral music such as the Brandenburg Concertos; solo instrumental works such as the cello suites ...
5 天前 · Saint Patrick's Day, or the Feast of Saint Patrick (Irish: Lá Fhéile Pádraig, lit. 'the Day of the Festival of Patrick'), is a religious and cultural holiday held on 17 March, the traditional death date of Saint Patrick (c. 385 – c. 461), the foremost patron saint of Ireland. Saint Patrick's Day was made an official Christian feast day in ...
1 天前 · The Bay of Pigs Invasion (Spanish: Invasión de Bahía de Cochinos, sometimes called Invasión de Playa Girón or Batalla de Playa Girón after the Playa Girón) was a failed military landing operation on the southwestern coast of Cuba in 1961 by Cuban Democratic Revolutionary Front (DRF), consisting of Cuban exiles who opposed Fidel Castro's Cuban Revolution, clandestinely financed and ...
