Replay: Why a Wildlife Biologist Traded Mice for the World's Most Dangerous Predator

When polar bear biologist Alysa McCall was growing up in Kamloops, British Columbia, watching black bears raid fruit trees outside her living room window, she never imagined she'd dedicate her life to their Arctic cousins. But sometimes the most profound career changes happen when you least expect them—like when a world-renowned scientist responds to your "what's the worst that could happen?"…