The Chinese invented the wheelbarrow around 100 CE during the Han dynasty. These early wheelbarrows had a single wheel at the front, making it easy for one person to carry heavy loads. A single soldier, using this "wooden ox," could transport enough food to feed four men for a month! The Shu Han kingdom even tried to keep this technology a secret to maintain their advantage in battles. This ancient invention showcases China's incredible ingenuity and its impact on history.