Guinness has a mixing ball inside every can of beer : r/mildlyinteresting
Guinness US on Twitter: "No, it's not a ping pong ball, it's the “widget” that gives Draught in a can that foamy head. Here's how it works: http://t.co/Tu2kkHiU7r" / Twitter
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What Is In The Guinness Beer Can? - BlackTailNYC.com
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