John Green explains how historians have determined the age of the Earth. He mentions that they created a quantitative chronology of human history by using ancient documents and events. He also states that various thinkers throughout history have used fossils and rocks to determine the Earth's actual age.
Ernest Hemingway narrates the opening of a The Spanish Earth, a film he wrote with John Dos Passos to bring the realities of the Spanish Civil War to a worldwide audience. It was created with the support of the left-leaning Republican, democratically elected government in Spain who were in conflict with Nazi Germany and Fascist Italy backed Nationalist forces under Francisco Franco.
Queen Isabella of Spain funds Christopher Columbus' voyage to the New World, and Bugs Bunny tags along. This clip highlights some key aspects of the voyage across the Atlantic Ocean in a comical manner. One inaccuracy in this clip is that Christopher Columbus did not debate the round shape of the Earth but the size of it.