With 47 billion gallons of beer drunk around the world each year, beer is second only to tea as the world’s most popular beverage. And we’re being inundated with pure, low-carb, and additive-free beer. So are traditional beers full of additives and preservatives? What’s the difference between ale and lager? Carolyn also investigates why so many women hate the taste, and if some beer could lower a man’s sperm count.