Archaeologists said a black substance found in an ancient tomb in northwest China's Shaanxi province is a 2,000-year-old portion of beef. Scientists arrived at the conclusion after months of analysis confirmed the substance's makeup, according to Hu Songmei, a paleontologist from the provincial archaeological institute. Xinhua news agency reports that according to Hu, the beef -- most of which had been carbonised -- is the earliest beef product discovered in China. The beef was discovered two years ago in a bronze pot placed in a tomb believed to date back to the Warring States Period (475 B.C. -- 221 B.C.),...