Around 700 AD, the Arabs ruled over about 60 million people. At the head of the empires there was a caliph. Right below were the governors of the provinces, who primarily collected taxes. Author: ZDF/Terra X/Gruppe 5/ Susanne Utzt, Sahar Eslah, Martin Carazo Mendez/ Martin Christ, Marc Riemer, Joac
In ancient Egypt, the ancestor of the domestic cat was revered and became the companion of people. From the realm of the pharaohs, the first tame specimens probably reached today's Europe with Roman soldiers. Author: ZDF/Terra X/Spiegel TV/ Nanje de Jong-Teuscher, Kirsten Hoehne/Anja Schütze, Uli W
For more Science Videos: https://lt.org/ * Having played an acknowledged role in the 2011 Fukushima disaster, it has long been understood that hydrogen penetration can accelerate the deterioration of structural materials. In this video, BAPTISTE GAULT analyzes this process of hydrogen embrittlement
