Humanoid Robots
Walking on two legs sounds like a stunt, but the reason is practical: doors, stairs and tool handles were all built around human proportions. Degrees of freedom, payload and realistic timelines differ machine by machine.
Two-legged walking costs far more than wheels in balance, energy and joints, but buys freedom from retrofitting: shelves, stairs, doors and tools are all sized for the human body. Tesla Optimus hauls parts in its own factories, UBTech Walker pursues reception and R&D platforms, and Unitree extends its motor know-how into H1 and G1 at research-friendly prices. Battery, payload and fall recovery matter more than height and degrees of freedom.
