This week, Travis and Amanda discuss and analyze the second half of UNDERLAND: A DEEP TIME JOURNEY, a scientific and philosophical exploration by Robert Macfarlane. Grab your sturdiest miner's helmet and your finest spelunking ropes because we are headed deep underground for some scientific, philosophical, and literary explorations. Macfarlane's intellectual interests -- like his journeys across Europe -- are fairly diffuse, so it's best to come to this book with an open mind. If you do, you will be rewarded with beautiful, even rhapsodic, prose and a bevy (Amanda would say an onslaught) of scientific facts. We're taking the train from the arctic circle down to the Mediterranean, so join us as we consider the many allures that the "underland" offers humankind.