Listener Erik saw a mysterious glow in the water during a trip to the beach, and he wants to know more. ELT talks to the “Jacques Cousteau of glow,” a scientist who has spent decades deep diving for answers. Guest: biologist and ocean researcher Edie Widder. Thanks to Eelke Dekker for the seagull and ocean sounds we used in this episode. Thanks also to Steven Haddock, Michael Latz, Matt Davis, Vincent Pieribone, and Severine Martini.