Liquid-metal wire stretches eight times its original length

For those times when you need extra length in your headphones or phone charger, there’re now super-stretchable wires. In the not-too distant future, they could be woven into fabrics – think gym clothes with an embedded heart rate monitor to help you burn off the holiday fat.

The wire “has perfect electrical properties without compromising the mechanical properties at all,” Michael Dickey, an assistant professor of chemical and biomolecular engineering at North Carolina State University, told NBC News.