a gravitational pull

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The pour shot, a staple of beer ads, may never have been more glorified than in such TV spots as “Why man has five senses” for Guinness Stout, by Weiss Stagliano Partners in New York.
But observant drinkers may note an unusual characteristic of Guinness: In a newly poured pint, air bubbles on the side of the glass appear to float downward, seemingly defying the fact that air is lighter than Stout.
Why this happens has now has been answered by a computer, according to Fluent, the New Hampshire maker of Fluent software.

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