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It's an old technology for storing energy that's finally getting an update, and it's appearing everywhere from power plants to Formula One race cars, and will soon be hiding in your wheels, helping save you fuel. It's a not a new battery or super-hot liquid salt .

Skipper Peter Holmberg sprung catlike between the twin helms of Sojana, his boat shoes squeaking on the sailing yacht’s deck as he rushed back and forth with each tack and jibe.