Life on earth began in the ocean and then moved onto the land. But one precocious line of mammals returned to the sea. How has water shaped the minds, the bodies, the sensory worlds and the societies of whales? Our guide is Jeff Warren. Jeff is an explorer of consciousness in its various forms. In 2007 he published a book called The Head Trip: Adventures on The Wheel of Consciousness. He's spent the past 2 years thinking about whales and dolphins, visiting researchers in their labs and in their boats around North America and the Caribbean to find out what they're learning about mind, culture and society in the ocean.