The idea that the deep sea is filled with darkness is all wrong — it’s actually filled with light down there. Marine biologist Edith Widder is senior scientist at the Ocean Research & Conservation Association, and she joins host Krys Boyd to discuss bioluminescence, which illuminates the ocean hundreds of feet below the earth’s surface, and about how this little understood ecosystem is deteriorating due to climate change. Her book is “Below the Edge of Darkness: A Memoir of Exploring Light and Life in the Deep Sea.”