TIL that during the Mongol invasion of Baghdad in 1258, the Tigris River is said to have run black with ink from the countless books thrown into the river from the city's libraries

https://www.historyofinformation.com/detail.php?id=249
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1g6r088/til_that_during_the_mongol_invasion_of_baghdad_in/