In 1965, fossils of Yuanmou Man were discovered in Yuanmou County, Yunnan Province. Yuanmou Man, who lived 1.7 million years ago was the first Homo erectus ever found within the boundaries of China. The two fossil teeth unearthed were from the inside upper jaw of a young male. In the same layer, stone chips and stone tools with traces of the work of man along with a three-meter-thick layer of earth containing carbon indicated that man had already begun to make simple tools and knew how to use fire. In 1929, a skull fossil of Peking Man who lived some 200,000 to 700,000 years ago was discovered in Zhoukoudian, Fangshan, in suburban Beijing. The skull showed a brain capacity of 1,059 ml., lower than the average brain capacity of 1,400 ml. of modern man. Analysis shows that Peking Man had the ability of simple thinking and speaking, and could walk straight and engage in productive labor. From the same site, fossils of bones and teeth belonging to more than forty men and women of different ages were unearthed along with more than 100,000 pieces of roughly processed stone tools for cutting, smashing, chopping and trimming. Also found was a layer of accumulated ashes six meters thick and animal bones that had been burned, which suggested that Peking Man used fire to cook his food.