Robot caregivers?

El-E works by using dozens of sensors, lasers and cameras that help it find its target item and judge the grip needed to retrieve it. A mechanical crane that can grab items from the floor or shelves dominates its slender body. It rolls around on three wheels, and it's all powered by a lone Mac mini, which sits in its base.

Researchers hope the laser-directed robot could someday open doors, switch light panels and guide patients, but it still has a way to go.

The robot's arm can only carry objects up to 1.2 pounds, and it has yet to be tested with sick patients. And when it does malfunction, it can be a bit disarming.

On a recent trial run, the El-E took a winding path on its mission to pick up a coffee mug, halting several times during its short journey. When Kemp and his students finally figured out the problem was a low battery, it moved smoothly again, stuttering only a bit as it tightened its grip on the cup. It wheeled around and paused for a few seconds before detecting the user's face and delivering the mug.

"Bob's your uncle," it blurted out.

Mission accomplished.