A wheel, a wooden frame, and two handles may not sound revolutionary, but one of history's most useful inventions appeared in China centuries before it became common in Europe.

The earliest clear evidence of wheelbarrows comes from China during the Han Dynasty, around the first and second centuries CE. Europe did not begin using wheelbarrows until roughly a thousand years later.

What made many Chinese wheelbarrows especially ingenious was their design. Unlike the familiar European version, which placed the wheel at the front, many Chinese wheelbarrows positioned a large wheel directly beneath the load. As a result, the wheel carried most of the weight instead of the person pushing it.

That simple change dramatically increased what a single person could transport. Workers used wheelbarrows to move crops, building materials, and other heavy cargo. Armies used them to carry food, equipment, and supplies over long distances.

Some military accounts suggest wheelbarrows occasionally served another purpose as well. Groups of them could be arranged into temporary barricades, creating a movable obstacle that helped protect soldiers and slow cavalry attacks. Rather than digging trenches or constructing permanent defenses, troops could quickly assemble and reposition these makeshift barriers as conditions changed.

Historical descriptions even tell of unusually large wheelbarrows capable of carrying several passengers at once. In some regions, sails were sometimes attached so favorable winds could help move heavy loads along open roads.

The wheelbarrow may seem humble compared with inventions such as the compass or printing press. 

Yet for centuries it effectively multiplied human strength, allowing one person to move loads that might otherwise require several workers or a pack animal.