Liliana Rezende de Castro (Quito, June 29, 1979 ) is an Ecuadorian - Brazilian actress who has lived in Brazil since she was sixteen years old. She is best known for her roles as Polca in Ilha Rá-Tim-Bum, Luna in Alma Gêmea, Janete in the Os Mutantes Saga, and Filomena in Ribeirão do Tempo. Since 2012 she has lived in the United States, where she runs the English-language science channels Socratica and Socratica Kids on YouTube.