Did you know that the foam on a can of Guinness comes from a widget? It's a ball of nitrogen that is released into the stout when the can is opened. Now that you know, widgets may be on the way out. Nitrogen-infused sto...
https://www.neatorama.com/2011/03/10/the-physics-of-stout-foam/
The Physics of Stout Foam...
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