The wheel: We've been working on it for more than 6,000 years and still haven't perfected it. Charles Guan (engineer and developer of combat robots) realized while designing the Overhaul 2.0 combat robot that the wheel could be reinvented and improved. Wheel design: A powerful 6-wheel drive was intended to give the Overhaul 2.0's grapple a speed advantage in combat [...]