If there’s a magic ingredient in beer, it’s yeast.
It’s the tiny living organism that takes the grain, hops, and water you have beforehand and converts that mixture into the delightful beverage that human civilisation has celebrated for thousands of years.
But it was only in the 19th century, relatively recently in the history of beer, that scientists isolated yeast itself, understanding the full role that these tiny creatures played.
Different types of yeast make different beers. While some produce consistent and predictable results, others can be incredibly unpredictable.
Read more from the source: Tasting the Carlsberg Rebrew beer made with ancient lager yeast