Two-legged robots have a tendency to fall over and "need human intervention to get back up," like tortoises fallen on their backs. Because they're heavy and unstable, they are "currently unsafe for humans to be close to when they are walking."

While Tesla and Musk’s Optimus robot snatches airtime, China is making leaps in the humanoid race, leading to a rally in the sector’s shares. The Solactive China Humanoid Robotics Index rose 60 per cent from the start of last year to its peak in October,

Chinese company Agibot showed up with two: the human-sized A2 and the slightly smaller X2, both of which were displaying their surprisingly impressive dancing abilities.

Engineers and computer scientists are developing AI-powered robots that look and act human. Boston Dynamics invited 60 Minutes to watch its humanoid, Atlas, learn how to work at a Hyundai factory.

Agibot just released a robot dog, a factory-worker humanoid robot on wheels, a "white-collar" humanoid robot for reception-like duties, and a playful dancing robot.

With the age of humanoids upon us, Tesla CEO Elon Musk predicted that his robots will curb crime, eliminate poverty and do surgery.