Archaeologists scraped fecal bits off these ancient wipe sticks, discovered in a 2,000-year-old latrine at a pit stop along the Silk Road in Dunhuang, China. (credit: Hui-Yuan Yeh) For almost 1,500 years, the many trade routes known today as the Silk Road joined eastern China with western China, India, the Middle East, Europe, and the Swahili Coast of Africa.