At less than one and a half inches tall, roughly the same height as a LEGO minifigure, the world's smallest self-contained ...

At just under one and a half inches tall—about the height of a LEGO minifigure—Zippy is the world’s smallest self-powered ...

Thus, he set out to build a better actuator to support his ... actuator shake around some dumbells on a long lever arm. Walking robots have exploded in popularity ever since Spot hit the scene.

A machine without electronics or software can walk, jump, and swim—showing how simple physics can compete with complex robotic systems.

Second, because these robots need very little to get walking, they're easy to build and only cost around $20 a pop. Finally, their ability to move around without electronics means they can venture ...