The information in this article comes from Disneys John Carter and is not written by Edgar Rice Burroughs.

The Voice of Barsoom is a drink drescribed as a "strong foul smelling brew" that the Tharks use to teach their children to speak, the infants are force-fed the drink. The effect seems to be almost immediate, the drinker being able to fully understand the barsoomian language.

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