In 1987, Richard Greenhill, a British photographer who was fascinated by (but had no actual training in) robotics, decided he wanted to build a life-size humanoid that could do useful things, like ...

Bipedal robots aren’t just human-shaped machines with arms and legs. At the cutting edge of robotics, they can also take the form of tiny, power-packed marvels. Meet “Zippy,” a palm-sized, two-legged ...