It makes me happy to watch the little bubbles in the fermentation lock. The cheerful little burbling is easy to forget that its the feces of small animals. Ale yeasts (or Saccharomyces cerevisiae), being all single-celled as they are, are not like us. They dance around all day eating sugar. Where does it go? Like any animal, they have a digestive system. They make little tinkles called alcohol, and little doodies called CO2. There's your science for today, kids!
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