That peculiar feeling when you read this:
"Taiping Rebellion, radical political and religious upheaval that was probably the most important event in China in the 19th century. It lasted for some 14 years (1850–64), ravaged 17 provinces, took an estimated 20 million lives, and irrevocably altered the Qing dynasty (1644–1911/12)."
Please note that other documents mention the number of deaths may have been as high as 30 million in 14 years.
Don't even ask me how I reached that page.