ew research findings are likely to provoke a hair-raising response from some pubgoers in Ireland and Britain.

Research commissioned by the Guinness people - the Dublin-based brewers of the famous stout that bears their name - shows that nearly $700,000 a year worth of the ubiquitous black beverage stays in drinkers' mustaches and beards rather than going down their gullets. The company, getting technical, calls it ''inter-fiber retention'' in facial hair.It remains to be seen whether there will be a rush on razor blades - or at least considerably more vigor being put into wiping mustaches.

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