HUMANOID ROBOTS ARE HERE, BUT THEY'RE A LITTLE AWKWARD. DO WE REALLY NEED THEM?

Building a robot that's both human-like and useful is a decades-old engineering dream inspired by popular science fiction.

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While the latest artificial intelligence craze has sparked another wave of investments in the quest to build a humanoid, most of the current prototypes are clumsy and impractical, looking better in staged performances than in real life. That hasn't stopped a handful of startups from keeping at it.

"The intention is not to start from the beginning and say, 'Hey, we're trying to make a robot look like a person," said Jonathan Hurst, co-founder and chief robot officer at Agility Robotics. "We're trying to make robots that can operate in human spaces."

Do we even need humanoids? Hurst makes a point of describing Agility's warehouse robot Digit as human-centric, not humanoid, a distinction meant to emphasize what it does over what it's trying to be.

What it does, for now, is pick up tote bins and move them. Amazon announced in October it will begin testing Digits for use in its warehouses, and Agility opened an Oregon factory in September to mass produce them.

Digit has a head containing cameras, other sensors and animated eyes, and a torso that essentially works as its engine. It has two arms and two legs, but its legs are more bird-like than human, with an inverted knees appearance that resembles so-called digitigrade animals such as birds, cats and dogs that walk on their toes rather than on flat feet.

Rival robot-makers, like Figure Al, are taking a more purist approach on the idea that only true humanoids can effectively navigate workplaces, homes and a society built for humans. Figure also plans to start with a relatively simple use case, such as in a retail warehouse, but aims for a commercial robot that can be "iterated on like an iPhone" to perform multiple tasks to take up the work of humans as birth rates decline around the world.