ArticleHead GamesA nitrogen injection can put a little Dublin in your brew.Already a member? Log InWritten by Sal EmmaYou'll Also Like Article MEMBERS ONLY Understanding the Science behind Beer Foam Beer foam: it’s more than just a layer at the top of your glass. Explore the science of the suds. Article FREE Fabulous Foam! A fluffy white head of foam is the perfect capper to a great beer. It enhances the appearance and flavor perception too. Make sure your beer looks as good as it tastes!