Metallic material can switch back and forth between hard and soft states

We may not yet have the liquid metal depicted in the Terminator movies, but scientists have now developed something that's vaguely along the same lines. German materials scientist Dr. Jörg Weißmüller and Chinese research scientist Hai-Jun Jin have created a metallic material that can change back and forth between being strong but brittle and soft but malleable, via electrical signals.

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