Dr. Andrew Knoll is the Fisher Professor of Natural History at Harvard University, and author of A Brief History of Earth: Four Billion Years in Eight Chapters. In this episode, we further condense those four billion years into one introductory-level conversation. Dr. Knoll walks us through Earth's early history and the evolution of life on Earth, his background in geology, and research examining what Earth's early history can tell us about how life evolved. For more in-depth coverage of these topics, see Dr. Knoll's book: https://www.amazon.com/Brief-History-Earth-Billion-Chapters/dp/0062853910