Why is "History of printing in East Asia" trending?

Wikipedia Overview

Printing in East Asia originated in China, evolving from ink rubbings made on paper or cloth from texts on stone tablets, used during the sixth century. A type of printing called mechanical woodblock printing on paper started in China during the 7th century in the Tang dynasty. The practice of woodblock printing soon spread throughout East Asia. As recorded in 1088 by Shen Kuo in his Dream Pool Essays, the Chinese artisan Bi Sheng invented an early form of movable type using clay and wood pieces arranged and organized for written Chinese characters. The earliest printed paper money with movable metal type to print the identifying code of the money was made in 1161 during the Song dynasty. In 1193, a book documented instructions on how to use the copper movable type. The use of metal movable type spread to Korea by the 13th century during the Goryeo period, with the world's oldest surviving printed book using moveable metal type being from 1377 in Korea.