Kombucha is a bubbly, fermented tea that has gained popularity in the health and wellness scene over the last decade — but what is it exactly? This week, the Reactions team breaks down kombucha's chemistry and investigates which ordinary beverages they can turn into kombucha.

Reactions is a video series produced by the American Chemical Society and PBS Digital Studios. Subscribe to Reactions at http://bit.ly/ACSReactions, and follow them on Twitter @ACSreactions.

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