Agility Robotics’ Cassie just became the first bipedal robot to complete an outdoor 5K run, completing the jaunt on a single charge.

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Agility Robotics’ Cassie just became the first bipedal robot to complete an outdoor 5K run — and it did so untethered and on a single charge.

The challenge: To create robots that can seamlessly integrate into our world, it makes sense to design those robots to walk like we do. That should make it easier for them to navigate our homes and workplaces.

But bipedal robots are inherently less balanced than bots with three or more legs, so creating one that can stably walk, let alone run or climb stairs, has been a major challenge — but AI is helping researchers solve it.