Propolis is a sticky brown substance bees use to protect their hive from the elements and from microorganisms. Humans have used propolis for its health benefits since the days of ancient Greece and scientists are now exploring exactly how this "bee glue" boosts our immune system. Watch as American science rapper, Tom McFadden (a.k.a. "The Rhymebosome") explores the history and science behind this fabled remedy.

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