Robot 'Hands' Write Without Fingers - ScienceNOWFingers off. Grain-filled sacks can mold around objects of almost any shape, where conventional robotic hands could slip. It turns out that opposable thumbs aren't critical for getting a good grip. Neither are fingers. Scientists have created a robotic arm that can do everything from serve drinks to draw pictures even though it has no digits. Fingers and thumbs work perfectly well for humans, says
