This week, Rising Tide Ocean host David Helvarg & Vicki Nichols Goldstein talk with David Shiffman, a marine biologist at Arizona State University and a science communicator known for tackling sharks and the sea with equal parts wit and expertise. Shiffman dives into shark evolution, their strange and wildly varied reproductive strategies, and the tangled politics of keeping them from vanishing. Hearing from a shark expert like Shiffman is a thrill in its own right—so listeners are invited to dive in on this episode of the Rising Tide Ocean podcast.