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3 天前 · The Northrop Grumman B-2 Spirit, also known as the Stealth Bomber, is an American heavy strategic bomber, featuring low-observable stealth technology designed to penetrate dense anti-aircraft defenses. A subsonic flying wing with a crew of two, the plane was designed by Northrop (later Northrop Grumman) and produced from 1987 to 2000.
- 17 July 1989; 34 years ago
- 1987–2000
- 21
4 天前 · Unit 731 ( Japanese: 731部隊, Hepburn: Nana-san-ichi Butai), [note 1] short for Manchu Detachment 731 and also known as the Kamo Detachment [3] : 198 and the Ishii Unit, [5] was a covert biological and chemical warfare research and development unit of the Imperial Japanese Army that engaged in lethal human experimentation and ...
- 1936–1945
- Biological weapons, Chemical weapons, Explosives
- Estimated 3,000 to 300,000, 400,000 or higher from biological warfare, Over 3,000 from inside experiments from each unit (not including branches, 1940–1945 only): 20 , At least 10,000 prisoners died, No documented survivors
2 天前 · A tiling with squares whose side lengths are successive Fibonacci numbers: 1, 1, 2, 3, 5, 8, 13 and 21. In mathematics, the Fibonacci sequence is a sequence in which each number is the sum of the two preceding ones. Numbers that are part of the Fibonacci sequence are known as Fibonacci numbers, commonly denoted Fn .
2 天前 · Human papillomavirus infection ( HPV infection) is caused by a DNA virus from the Papillomaviridae family. [5] . Many HPV infections cause no symptoms and 90% resolve spontaneously within two years. [1] . In some cases, an HPV infection persists and results in either warts or precancerous lesions. [2] .
- Human papillomavirus spread by direct contact
- None, warts
- Most people are infected at some point in time
1 天前 · Infobox references. Sulfuric acid ( American spelling and the preferred IUPAC name) or sulphuric acid ( Commonwealth spelling ), known in antiquity as oil of vitriol, is a mineral acid composed of the elements sulfur, oxygen, and hydrogen, with the molecular formula H2SO4. It is a colorless, odorless, and viscous liquid that is miscible with water.
1 天前 · C++ (/ ˈ s iː p l ʌ s p l ʌ s /, pronounced "C plus plus" and sometimes abbreviated as CPP) is a high-level, general-purpose programming language created by Danish computer scientist Bjarne Stroustrup.First released in 1985 as an extension of the C programming language, it has since expanded significantly over time; as of 1997, C++ has object-oriented, generic, and functional features, in ...
3 天前 · Godzilla vs. Kong is a 2021 American monster film directed by Adam Wingard. Produced by Legendary Pictures and distributed by Warner Bros. Pictures, it is a sequel to Kong: Skull Island (2017) and Godzilla: King of the Monsters (2019), and is the fourth film in the Monsterverse.
