<P> A widget is a device placed in a container of beer to manage the characteristics of the beer 's head . The original widget was patented in Ireland by Guinness . The `` floating widget '' is found in cans of beer as a hollow plastic sphere , approximately 3 cm in diameter ( similar in appearance to table tennis ball , but smaller ) with at least one small hole and a seam . The `` rocket widget '' is found in bottles , 7 cm in length with the small hole at the bottom . </P>
<P> A widget is a device placed in a container of beer to manage the characteristics of the beer 's head . The original widget was patented in Ireland by Guinness . The `` floating widget '' is found in cans of beer as a hollow plastic sphere , approximately 3 cm in diameter ( similar in appearance to table tennis ball , but smaller ) with at least one small hole and a seam . The `` rocket widget '' is found in bottles , 7 cm in length with the small hole at the bottom . </P>
why do cans of guinness have balls in them
why do cans of guinness have balls in them
to manage the characteristics of the beer 's head
to manage the characteristics of the beer 's head