This information has been compiled by the work of Joseph Needham and his colleagues in a study of ancient Chinese ... The Moldboard Plow: China, Third Centrury BCE. Called kuan, these ploughshares ...

Similar weapons with smelted iron blades suggest meteoritic metal could have informed early ironworking techniques. PHOTO: ZHAO ANG, GUO STATE MUSEUM, SANMENXIA, CHINA BACKGROUND: OWEN FREEMAN ...

Archaeologists think this innovation was independently discovered in several places and then spread through the ancient world ... heating and hammering cast iron to remove impurities and add ...