ArticleBitterness & The IBU – What’s It All About? In the earlier days of the American India pale ale, bitterness was king. The more Bitterness Units (BU), the better. We didn’t have the hazy-juicys, we had bitter and hoppy, piney, ashy,Already a member? Log InWritten by Dr. Pattie AronYou'll Also Like Article MEMBERS ONLY Testing Your Hypothesis: Experiments you should do Homebrewing and experimenting are about as old as brewing itself . . . but modern scientific method delineates theories and proven facts. Denny and Drew provide some pointers. Article MEMBERS ONLY It's Complicated: Understanding oxygen in brewing Oxidation has negative connotations in all areas of brewing except one. Learn how oxygen finds its way into our beer and some of the keys to controlling it.