North, South, East and West — the cardinal directions have a surprising history of cultural and social significance. Jerry Brotton, professor of English and history at the University of London, joins host Krys Boyd to discuss how something as simple as a compass has come to define our world — from how “the West” defines political power, what we mean by “the Global South,” and why cardinal directions might have been some of the very first words used in human language. His book is “Four Points of the Compass: The Unexpected History of Direction.”   Learn about your ad choices: dovetail.prx.org/ad-choices