Detail view of a beer in the upper area where the protective foam protects it from spoiling

Science, Fresh, Freshness, Area, Barley, Glass, Drink, Production, Quality, Craft, Top, Beverage, Protective, Protection, Laboratory, Refreshing, Temperature, Bubbles, Taste, Aroma, Flavor, Brew, Beer, Foam, Brewery, Pint, Ale, Mellow, Upper, Lager, Amber, Fermentation, Preserves, Malt, Carbonation, Stout, Bottled, Yeast, Canned, Hops, Detailview, Spoilage, Pilsner, Prevents, Sustains, Lagering, Microbrew, Sustaining, Beercap