A Three Year-Old Girl, a Colony of Dogs, and One Very Rare Side Effect

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Mathilda Crisp at home in Pasadena, CA with the stuffed bear she's had since she started experiencing mysterious symptoms at age three.
( Mary Harris/WNYC )
Music Credits: "Mathilda's Theme" by Cayce Means , "The Man Says - Instrumental" by Ruby Velle & The Soulphonics , "Space Drums" by Cayce Means , "Undersea Garden" by Podington Bear , "Lake Victoria" by Podington Bear , "Saver" by Podington Bear , "Back Stairs" by Podington Bear , "Stingray Theme" by Blue Dot Sessions , "Used Me Again (Now Lose Me Forever) - Instrumental" by Ruby Velle
WNYC Studios