Neil deGrasse Tyson is an astrophysicist who helps us find our place in the universe. The director of the Hayden Planetarium at the American Museum of Natural History and host and cofounder of the podcast “StarTalk” joins host Krys Boyd to make a case for the rationality of science – and to help us look at global challenges in new ways. His book is “Starry Messenger: Cosmic Perspectives on Civilization.”