second of China's mythical emperors, said to have been born in the 28th century BC with the head of a bull and the body of a man. By inventing the cart and plow, by taming the ox and yoking the horse, and by teaching his people to clear the land with fire, Shen Nung reputedly established a stable agricultural society in China. His catalog of 365 species of medicinal plants became the basis of later herbological studies. Tales of his youth relate that he spoke after three days, walked within a week, and could plow a field at age three.