The capital of Brazil, Brasilia, was built in just under four years, from 1956 to 1960. Rio had been the capital for almost 200 years prior to that. Pope Gregory IX was apparently a dog person, because he tried to exterminate all cats from Europe. Maya Angelou was the first African American woman to write a non-fiction best seller. The only full-length book that Eminem has ever read is LL Cool J's autobiography. Caterpillars liquefy in their cocoons before turning into butterflies. Potatoes were introduced to Ireland in the 1500s after they were discovered by Spanish colonizers of South America.