Skins of which fruit were used by aristocratic women in China to make black dye, which they often used to stain their teeth?
Which wars, from 1839 to 1842 and 1856 to 1860, were due to Britain smuggling goods from India into China in defiance of China's laws?
The following were influential in developing which subject in China: Liu Hui, Zu Geng, Li Chunfeng, Yang Hui, Shen Kuo, Liu Xin, Zhang Heng, Liu Hui, Zu Chongzhi and Wang Xiaotong?
