In the years after World War I, stunt pilots in small airplanes would fly throughout the country, performing tricks and selling rides to locals—introducing Americans to flight for the first time. By the end of World War II, says Historian Houston Johnson, air travel and airports were commonplace, in large part because of the efforts of the Works Progress Administration. Plus: The BBC television fantasy series Dr. Who has been around for more than 50 years and has a large devoted fan base here in America and around the world. This month saw the debut of the 12th doctor who can travel through time and space. Jason Barr is coeditor of the new book The Language of Dr. Who.

Later in the show: Over the past decade, Mexican drug traffickers trying to get their products to the U.S. have had a spiritual “protector.” Her name is Santa Muerte, and she’s a Mexican folk saint for not just drug traffickers, but prostitutes too. Andrew Chesnut is the author of Devoted to Death, in which he looks at Santa Muerte’s growing cult of followers in both Mexico and the U.S. Also featured: Africa is often thought of as a continent rife with wars, famines, wild animals, and primitive tribes. But Robert Vinson is working on a new book that challenges those ideas. He says Zulu people of South Africa were active shapers of the modern Atlantic world, influencing popular culture, literature, sports, and the Civil Rights movement.