Researchers have created a wire that has the ability to stretched up to eight times the original length. The wire is made with a filling of liquid metal alloy; gallium, and indium, both of them are great conductors of electricity, then they're surrounded by a thin elastic polymer. This wire can be used for most things. People have already tried to create a wire like this one, but none were as nearly as succesful. When the one gained elasticity, it would lose the conductivity, and vice versa. The only problem with this wire is what would happen with the wire opened, how would they contain the flowing liquid.
http://www.sciencedaily.com/releases/2012/12/121218121421.htm
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