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This Timelapse Video Is Proof That Your Beer Is Alive

Or at least it was. Scary stuff.

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Just look at this beer bubbling up over the edges of an open fermenter.

The full video follows an ale rising and falling as it ferments over six days.

View this video on YouTube

Sierra Nevada /

Yeast creates this effect as it breaks down the sugars in the barley and hops mixture. But don't worry, the yeast is filtered out before the beer is served.