A young field biologist, whose peripatetic childhood left her feeling rootless, searches for a sense of home in some of the world's wildest places. She works in extreme conditions in Antarctica, studying prey and predators, birds, and seals. In the process, she discovers fragility and terror, and, ultimately, the magic of life.

Guest: Naira de Gracia, field biologist and author of "The Last Cold Place: A Field Season Studying Penguins in Antarctica"