Scientists have explained why tapping a newly-opened beer bottle quickly turns booze into foam. LONDON: Scientists have explained why tapping a newly-opened beer bottle quickly turns booze into foam.

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Researchers believe the trick – which often leaves the unfortunate victim covered in beer – could help to explain some of the processes that take place in volcanoes Credit: Photo: Alamy/AP For Isaac ...

An old, hilarious if somewhat juvenile party trick involves covertly tapping the top of someone's newly opened beer bottle and standing back as the suds foam out onto the floor. Now researchers have ...