Radio interview with guest Karen Lloyd, PhD, Assistant Professor of Microbiology, The University of Tennessee, Knoxville. The average depth of the ocean is more than two miles deep. And down that far you’ll find mud that’s hundreds of feet thick. And in that mud, scientists have recently discovered a whole universe of microbes. Somehow, without sunlight, without oxygen, without obvious sources of food, these microscopic life forms manage to exist. If we could crack their secrets, we might have new solutions for improving life up here on land.