As the competition has evolved, more of the events have been tied into a central theme. For example, the 2008–2009 theme was "Latin America with a focus on Mexico". Language and literature was based on six short selections of literature as well as the novel "Bless Me, Ultima" by Rudolfo Anaya. Art focused on the art of Mexico and featured several pieces of work, ranging from Olmec earthenware to José Guadalupe Posada's "La Calavera Catrina". The music event included questions on Latin American music and included works by musicians as varied as Manuel de Zumaya, Silvestre Revueltas, Ástor Piazzolla and Xavier Cugat. Social science and economics focused on the history and economy of Mexico respectively. The Super Quiz covered an introduction to evolutionary biology, the historical development of the theory of evolution, natural selection, speciation, mutation, gene flow, genetic drift, and evolutionary developmental biology. Information was also included on Charles Darwin's voyage aboard HMS "Beagle".