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  1. en.wikipedia.org › wiki › Northrop_Grumman_B-2_SpiritNorthrop B-2 Spirit - Wikipedia

    3 天前 · The Northrop 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.

    • 17 July 1989; 34 years ago
    • 1987–2000
    • 21
  2. 2 天前 · Developed into. Supermarine Spiteful. Audio recording of Spitfire fly-past at the 2011 family day at RAF Halton, Buckinghamshire. The Supermarine Spitfire is a British single-seat fighter aircraft used by the Royal Air Force and other Allied countries before, during, and after World War II. It was the only British fighter produced continuously ...

  3. en.wikipedia.org › wiki › FormaldehydeFormaldehyde - Wikipedia

    2 天前 · Formaldehyde ( / fɔːrˈmældɪhaɪd / ⓘ for-MAL-di-hide, US also / fər -/ ⓘ fər-) ( systematic name methanal) is an organic compound with the chemical formula CH2O and structure H−CHO, more precisely H2C=O. The compound is a pungent, colourless gas that polymerises spontaneously into paraformaldehyde.

  4. 1 天前 · Fibonacci sequence. 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 .

  5. en.wikipedia.org › wiki › Human_brainHuman brain - Wikipedia

    2 天前 · The brain is the central organ of the human nervous system, and with the spinal cord makes up the central nervous system.The brain consists of the cerebrum, the brainstem and the cerebellum.It controls most of the activities of the body, processing, integrating, and coordinating the information it receives from the sense organs, and making decisions as to the instructions sent to the rest of ...

  6. 1 天前 · North American F-82 Twin Mustang. Piper PA-48 Enforcer. The North American Aviation P-51 Mustang is an American long-range, single-seat fighter and fighter-bomber used during World War II and the Korean War, among other conflicts. The Mustang was designed in April 1940 by a team headed by James H. Kindelberger of North American Aviation (NAA ...

  7. 3 天前 · Sigmund Freud (/ f r ɔɪ d / FROYD, German: [ˈziːkmʊnt ˈfrɔʏt]; born Sigismund Schlomo Freud; 6 May 1856 – 23 September 1939) was an Austrian neurologist and the founder of psychoanalysis, a clinical method for evaluating and treating pathologies seen as originating from conflicts in the psyche, through dialogue between patient and psychoanalyst, and the distinctive theory of mind and ...

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