Our guest is Sonia Shah, a science journalist who's long covered the intersection of science, politics, culture, and human rights for The New York Times, The Wall Street Journal, Foreign Affairs, Scientific American, and other outlets. Her new book, which she tells us about, takes on many of our centuries-long assumptions about migration. The book is called "The Next Great Migration: The Beauty and Terror of Life on the Move." This work, per The New York Times Book Review, focuses "with compassion and insight a deeply complex and challenging subject.... Shah effectively shows that understanding human migration is fundamentally an intersectional problem, incorporating race, ethnicity, religion, gender, class, economic inequality, politics, nationalism, colonialism, and health, not to mention genetics, evolution, ecology, geography, climate, climate change, and even plate tectonics.... Her work addresses issues of fundamental importance to the survival and well-being of us all."