Define the Changes in government rule that lead to some of China's most important inventions. The class explores the rise of the Tang and Song Dynasties, the first female ruler Wu Zhao, and inventions such as gunpowder, porcelain, and...

NOVA ferrets out long-forgotten secrets of architects and engineers of the early civilizations. Content focuses on the trebuchets of medieval Europe, the pharaoh's obelisks of ancient Egypt, the moai statues of Easter Island, the...