With brains six times the size of our own, the planet’s greatest mammals force a rethink of our own place on planet Earth.James Nestor is an author and journalist who has written for Outside Magazine, Men’s Journal, National Public Radio, The New York Times, Scientific American, Dwell Magazine, The San Francisco Chronicle, and more. His book, DEEP: Freediving, Renegade Science, and What The Ocean Tells Us about Ourselves (Houghton Mifflin Harcourt) was released in the United States and UK in June 2014.