Hold your horses. Calling these devices "bots" is a bit of a stretch: > The team makes its microrobots out of materials called biocompatible polymers using a t

Hold your horses. Calling these devices "bots" is a bit of a stretch: > The team makes its microrobots out of materials called biocompatible polymers using a technology similar to 3D printing. The machines look a bit like small rockets and come complete with three tiny fins. They also include a little something extra: Each of the robots carries a small bubble of trapped air, similar to what happens when you dunk a glass upside-down in water. If you expose the machines to an acoustic field, like the kind used in ultrasound, the bubbles will begin to vibrate wildly, pushing water away and shooting the robots forward. So it's essentially a small device that can be pushed around by an external field rather than an actual autonomous robot. But a tiny bot sure sounds more exciting than "remote-controllable dust".