In March 1974, a group of unsuspecting farmers digging a well near Xi'an, China, quickly noticed that they struck something unusual. What they thought might be an old pottery kiln turned out to be one ...

Long-term pale stool might be a sign of conditions that affect the bile ducts, liver, or gallbladder. Newborns with neonatal jaundice may have clay-colored stool due to high bilirubin levels.

A terrible drought struck the province of Shaanxi in 1974. The farmers there, who wanted to help themselves out, began to dig a well on the hills around Li Mountains, not far from Xi’an. No water came ...