 And when we conceive of refrigerators as necessary but not very exciting home appliances, we are seeing just the tip of an enormous world-changing iceberg that is the cold chain. Nicola Twilley is co-host of the podcast Gastropod, and she explores the fascinating history of chilling food in her new book, Frostbite, how refrigeration changed our food, our planet, and ourselves. Nicola, welcome back to Think. Thanks for having me. It's so good to be back.