From The Telegraph:Bubbles in Guinness really do go down instead of up, according to a study by scientists to mark St Patrick's Day.
As pubs stocked up with extra supplies of the black stuff in preparation for Ireland's national celebrations on Wednesday, scientists offered an explanation for why the famous Irish brew behaves so oddly.
Pour just about any other pint of beer, and the bubbles can be seen to obey the normal laws of physics. Filled with buoyant gas, they rise to the surface and form a frothy head.
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