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  1. El hidrógeno diatómico gaseoso, H 2, fue el primero producido artificialmente y formalmente descrito por T. von Hohenheim (más conocido como Paracelso), que lo obtuvo artificialmente mezclando metales con ácidos fuertes.

  2. Un libro electrónico, [1] libro digital o ciberlibro, conocido en inglés como e-book o eBook, es la publicación electrónica o digital de un libro.Es importante diferenciar el libro electrónico o digital de uno de los dispositivos más popularizados para su lectura: el lector de libros electrónicos, o e-reader, en su versión inglesa.

  3. The original bridge, most likely a wooden walkway, was built in 1256 and spanned the Aare at the Nydegg Fortress. The bridge was destroyed in a flood in 1460. Within one year, construction began on a new stone bridge. The small Mariakapelle (Mary's Chapel) located in the side of the bridge column on the city side was blessed in 1467.

  4. La cultura wari o huari fue una civilización andina que floreció en el centro de los Andes aproximadamente desde el siglo VII hasta el XIII d. C., llegando a expandirse desde los actuales departamentos peruanos de Lambayeque por el norte, Moquegua por el sur y hasta la selva del departamento del Cuzco por el este.

  5. York's Revolt (1455–1460) St. Albans. Richard of York, 3rd Duke of York led a force of around 3,000–7,000 troops south toward London, where they were met by Henry's force of 2,000 at St Albans, north of London, on 22 May 1455.

  6. en.wikipedia.org › wiki › MG_15MG 15 - Wikipedia

    History. The MG 15 was developed from the MG 30, which was designed by Rheinmetall using the locking system invented by Louis Stange in the mid to late 1920s. . Though it shares the MG 15 designation with the earlier gun built by Bergmann, the MG 15nA (for neuer Art, meaning new model having been modified from an earlier design) has nothing in common with the World War II gun except the model n

  7. The Battle of Wakefield took place in Sandal Magna near Wakefield in northern England, on 30 December 1460.It was a major battle of the Wars of the Roses.The opposing forces were an army led by nobles loyal to the captive King Henry VI of the House of Lancaster and his Queen Margaret of Anjou on one side, and the army of Richard, Duke of York, the rival claimant to the throne, on the other.