The reason China is one of my maps is during the seventh-century there was a Chinese remedy of quicksilver fried in oil. Quicksilver or mercury poisoning was used as an effective means of attaining sterility for a women that would swallow one of their remedies, if it didn't kill her first.
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Key Left to Right, Top to Bottom
Yellow: Qinghai, Yunnan, Inner Mongolia, Chong Qing, Peking, Jiangsu.
Green: Xinjiang, Shaanxi, Hunan, Hebei, Anhui, Fujian, Heilongjiang.
Red: Tibet, Ningxia, Shanxi, Liaoning, Zhejiang, Taiwan.
Yellow: Qinghai, Yunnan, Inner Mongolia, Chong Qing, Peking, Jiangsu.
Green: Xinjiang, Shaanxi, Hunan, Hebei, Anhui, Fujian, Heilongjiang.
Red: Tibet, Ningxia, Shanxi, Liaoning, Zhejiang, Taiwan.