La estructura de la dominación en el Imperio árabe

Alrededor del 700 d.C., el Imperio árabe gobernó a más de 60 millones de personas. Estaba encabezado por el califa. Justo debajo de él estaban los gobernadores de las provincias, que principalmente recaudaban impuestos. Autores: ZDF/Terra X/Grupo 5/Susanne Uzt, Sahar Eslah, Martin Carazo Méndez/ Martín Cristo, Marc Riemer, Joachim C. Seck/ Igor Garbuzenko, Ramin Sabeti, /Faber Courtial, Jörg Courtial/Grupo 5 FX, creativo xkopp Traducción y doblaje: alugha Haz clic aquí para más vídeos: https://alugha.com/TerraX

LicenseCreative Commons Attribution-ShareAlike

More videos by this producer

Voyager 2 and the scale of the solar system

In 1977, NASA's Voyager 2 space probe began its journey to the planets of our solar system. But the probe also provides clues about the solar system beyond the planets. Author: ZDF/Terra X/C. Haak/A.M. Wendlandt, Nikolai Holzach Translation and redub: alugha Click here to see more videos: https:

Causes of air pollution

Air pollution has many causes. The biggest polluter is energy production, with two-thirds of particulate emissions coming from coal-fired power plants. Road traffic and factory farming in agriculture also contribute to this. Author: 3sat/nano/Labo M/Johan von Mirbach/Chris Caliman/Christoph Valenti

What are viruses and how do they attack?

There are probably 100 million different types of viruses. Their attacks always follow the same pattern. The viruses attach to a cell, transfer their genetic material and force the host cells to produce new viruses. Author: 3sat/nano/Docstation/Johan von Mirbach/Anna Grün/Riccardo Giese/Nico Schleg