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Scientists in North Carolina State University have achieved something that in the future may prove to be rather remarkable: They've used a liquid metal alloy of gallium and indium squeezed through a tiny syringe to craft 3-D metallic structures. The device is effectively a 3-D printer for metal at room temperature.

The team behind the innovation sees it as an exciting hint of things to come. 3-D wiring could make it easy to craft highly flexible electronics—a valuable trick, given the rise in wearable tech.