Dinosaurs and Disaster: "The Ends of the World" by Peter Brannen

You've likely heard about the calamity dinosaurs underwent, but author Peter Brannen says that wasn't the worst catastrophe life on earth faced since the beginning. Brannen talks about the 5 major mass extinctions through earth's history and where we sit now in relation to them all. Brannen is the author of The Ends of the World: Volcanic Apocalypses, Lethal Oceans, and Our Quest to Understand Earth's Past Mass Extinctions.