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It's not quite as advanced as in Terminator 2, but a way of 3D printing liquid metal could offer a new range of flexible electronics. An alloy of metals gallium and indium that is liquid at room temperature forms a thin skin when exposed to air, which is strong enough to hold the liquid's shape. Michael Dickey of North Carolina State University in Raleigh and colleagues put the alloy in a syringe and were able to squeeze out wires, about a centimetre tall, that stood vertically despite their liquid centre.