Dolphins have long been regarded for their remarkable intelligence and social skills. When the dolphin genome was first sequenced in 2011, scientists learned that the beloved aquatic mammals are even more like us than we previously thought.

This week's Please Explain is all about dolphins, their remarkable intelligence and their relationship to humans, with journalist Susan Casey, author of Voices in the Ocean: A Journey into the Wild and Haunting World of Dolphins. She embarked on a two-year global adventure to explore the nature of dolphins. 

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