500 years ago, yeast?s epic journey gave rise to lager beer
Medieval History

500 years ago, yeast?s epic journey gave rise to lager beer


In the 15th century, when Europeans first began moving people and goods across the Atlantic, a microscopic stowaway somehow made its way to the caves and monasteries of Bavaria.

The stowaway, a yeast that may have been transported from a distant shore on a piece of wood or in the stomach of a fruit fly, was destined for great things. In the dank caves and monastery cellars where 15th century brewmeisters stored their product, the newly arrived yeast fused with a distant relative, the domesticated yeast used for millennia to make leavened bread and ferment wine and ale. The resulting hybrid ? representing a marriage of species as evolutionarily separated as humans and chickens ? would give us lager, the clear, cold-fermented beer first brewed by 15th century Bavarians and that today is among the most popular ? if not the most popular ? alcoholic beverage in the world.

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