When Was The Wheel Invented?

Wheel invention was one of the major milestones in human history. However, till now no one can really tell who invented the wheel or when exactly it was invented. The oldest wheel found by the archeologists dates back to 3,500 years. This wheel was found in Mesopotamia. Archeologists suppose that first wheels were invented and used some place in Asia around 8,000 B.C. However, none of those ancients wheels were preserved.