Guinness's new gaseous nitrogen-powered "rocket

Guinness's new gaseous nitrogen-powered "rocket widget" generates a perfect head on bottled stout.

"The new widget looks like a rocket," says Joe Bergin of Guinness Technical Support and Innovation, the division responsible for R&D, based in Dublin, Ireland. "It even has fins, for safety, to make sure the widget stays in the bottle." While the canned draught Guinness uses liquid nitrogen to create its head, the bottle uses gaseous nitrogen.

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