Water might be the most varied chemical compound on the planet.  Plain old H2O is the same anywhere, of course.  But brewing with pure water is not only expensive, but leads to poor beer - flat,...
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Yeasts are living organisms, a uni-cellular fungus, and have a rare ability: to live with or without oxygen.  In the presence of air, they multiply.  In the absence of oxygen, they ferment sugars...
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Beers are most commonly divided into two great classes, ales and lagers, depending on the yeast strain used in fermentation.  But most ale and lager yeasts are cultured, with many hybrids and...
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