Basil i claimed that he commissioned the mosaic of the virgin and child enthroned in hagia sophia to replace the one that

Basil I, also called the Macedonian and the founder of the Macedonian dynasty of Byzantium, the dynasty whose rule was the most prosperous time in the Byzantium history, started the revival of art and he ordered the mosaic in order to, in his words, replace the one the impostors had broken.

from the conditions of the working class in england by friedrich engels,the main idea is :

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)