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This is what I got off of the guinness.com website:
Glad you asked. The widget is a plastic molded device that sits on the top of the contents of each can of GUINNESS® Draught. When the can is opened, a small amount of beer and nitrogen, trapped in the widget, is forced out through the beer, which creates the famous creamy head that you find on a pint of GUINNESS® Draught served in a pub. The widget gives GUINNESS® Draught in cans the taste and texture of a pub-poured pint at home. In GUINNESS® Draught in bottles, the clever little 'rocket' widget floats free in the beer to refresh the creamy head of your GUINNESS® Draught with each swig you take from the bottle.
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RossThe white ball in a Guinness beer can is called a widget. It is a small plastic or metal sphere that helps recreate the creamy head of a draught pint when the can is opened. The widget releases nitrogen gas when the can is opened, producing bubbles that give the beer its signature smooth texture and creamy head.
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