Quote:
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A ping-pong ball-like “rocket widget” is added to the product during the canning phase at the brewery. The widget ball contains nitrogen (N2). When the can is opened, the valve inside the widget is broken and nitrogen gas is released into the beer, forming a finely-bubbled, beautiful head. The widget ball is found in Kilkenny and Guinness beer cans.
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Haha, on BSD my first year we cut open a can of Guinness so that we could see the Widget. And then we played ping pong with it
