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  2. Schumann resonances - Wikipedia

    en.wikipedia.org/wiki/Schumann_resonances

    The global electromagnetic resonance phenomenon is named after physicist Winfried Otto Schumann who predicted it mathematically in 1952. Schumann resonances are the principal background in the part of the electromagnetic spectrum [2] from 3 Hz through 60 Hz [3] and appear as distinct peaks at extremely low frequencies around 7.83 Hz (fundamental), 14.3, 20.8, 27.3, and 33.8 Hz.

  3. Extremely low frequency - Wikipedia

    en.wikipedia.org/wiki/Extremely_low_frequency

    The fundamental Schumann resonance is at approximately 7.83 Hz, the frequency at which the wavelength equals the circumference of the Earth, and higher harmonics occur at 14.1, 20.3, 26.4, and 32.4 Hz, etc. Lightning strikes excite these resonances, causing the Earth–ionosphere cavity to "ring" like a bell, resulting in a peak in the noise ...

  4. Musical cryptogram - Wikipedia

    en.wikipedia.org/wiki/Musical_cryptogram

    for Schumann, used in Carnaval, it is a re-ordering of that piece's A-S-C-H motif F, A, E and F, A, F for Frei aber einsam and Frei aber froh , "free but lonely" and "free but happy" in German; the former, his friend Joseph Joachim 's motto ( F-A-E Sonata ), described as "more romantic" than the latter, a "gender-separatist" motto of Johannes ...

  5. List of Microsoft Windows versions - Wikipedia

    en.wikipedia.org/wiki/List_of_Microsoft_Windows...

    These two lines were reunited into a single line with the NT-based Windows XP; this Windows release succeeded both Windows Me and Windows 2000 and had separate editions for consumer and professional use. Since Windows XP, multiple further versions of Windows have been released, the most recent of which is Windows 11.

  6. Lavarand - Wikipedia

    en.wikipedia.org/wiki/Lavarand

    Lavarand, also known as the Wall of Entropy, is a hardware random number generator designed by Silicon Graphics that worked by taking pictures of the patterns made by the floating material in lava lamps, extracting random data from the pictures, and using the result to seed a pseudorandom number generator. [1]

  7. Geistervariationen - Wikipedia

    en.wikipedia.org/wiki/Geistervariationen

    The Geistervariationen (Ghost Variations), or Theme and Variations in E-flat major for piano, WoO 24, composed in 1854, is the last piano work of Robert Schumann.The variations were composed in the time leading up to his admission to an asylum for the insane and are infrequently played or recorded today.

  8. Master Raro - Wikipedia

    en.wikipedia.org/wiki/Master_Raro

    Master Raro was a notable character that appeared in many of Robert Schumann's character pieces for solo piano. Raro may represent the union of (Clara + Robert).He was the personality that balanced the two contrasting natures of Eusebius (passive, dreamy) and Florestan (aggressive, enthusiastic).

  9. Friedrich Trautwein - Wikipedia

    en.wikipedia.org/wiki/Friedrich_Trautwein

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