Dr. Helen Scales is a marine biologist, writer, and broadcaster. She is the author of the Guardian bestseller Spirals in Time, New Scientist book of the year Eye of the Shoal, and the children’s book The Great Barrier Reef. She writes for National Geographic Magazine, the Guardian, and New Scientist, among others. She currently teaches at Cambridge University. This interview covers Eye of the Shoal and Poseidon's Steed.