by P. C. W. Davies, J. Brown · Alianza · tapa blanda · ISBN 9788420604480
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«Supercuerdas ¿una teoría de todo?» is the popular science essay by P. C. W. Davies and J. Brown, published by Alianza in paperback (288 pages).
Explains string theory without resorting to mathematics, narrating the historical search for a unified physics: from Newton and Maxwell to the electroweak force, up to superstrings as a possible way to integrate gravity with the other interactions. The text arises from interviews for the BBC conducted by P. C. W. Davies and J. Brown.
Spanish edition of the El Libro de Bolsillo collection from Alianza Editorial; the English original, Superstrings: A Theory of Everything?, was published in 1988.
Suitable for readers interested in theoretical physics seeking an approach without formulas.
The Brown Jurassic or Brown Jura in earth history refers to the middle of the three lithostratigraphic units of the South German Jurassic, the latter being understood not as a geographical, but a geological term in the sense of a lithostratigraphic super group. Formerly and even occasionally today in the popular scientific literature, this term is equated to the chronostratigraphic series of the Middle Jurassic. This is however not quite correct, because the Brown Jura does not exactly coincide with the chronostratigraphic boundaries of the Middle Jurassic. In addition, the term Dogger, which was formerly frequently used as a synonym should no longer be used in connexion with the South German Jurassic. Instead the term "Dogger" should be reserved for the roughly equivalent lithostratigraphic unit in the North German Jurassic. The Brown Jurassic was deposited about 175-161 million years ago. The Brown Jurassic follows the lithostratigraphic unit of the Black Jurassic and is superimposed on the lithostratigraphic group of the White Jurassic.
