Susanna Zaraysky, speaker of nine languages, is one of those people who seem able to pick up French or Portuguese almost overnight. In reality, it's not so effortless—but is she cognitively predisposed to attaining fluency in so many languages? We follow her to an MIT lab where researchers put her through a series of tests.

Photo by Patrick Cox. Music by Silver Maple, Lucention, Pause For Concern, Podington Bear and Blue Dot Sessions. Read a transcript of this episode here.