Jellyfish get a bad rap – they sting us when we’re at the beach, clog power plants and harm fisheries. Still, you’ve got to respect the fact that they’ve navigated our oceans for more than 500 million years. Juli Berwald joins guest host Lauren Silverman to talk about these fascinating creatures and her study of them across the world. Her new book is called “Spineless: The Science of Jellyfish and the Art of Growing a Backbone” (Riverhead Books).