In this special Earth Day episode, Julia Louis-Dreyfus chats with 89-year-old marine biologist and oceanographer Dr. Sylvia Earle, who joins from a boat in the Gulf of Mexico. Sylvia shares what it's like to walk untethered on the ocean floor, how her first dive changed her life, and the ocean's vital role in our survival. Plus, Julia tells a comical story about the one-and-only time she went scuba diving. She and her 91-year-old mom, Judy, also reminisce about snorkeling adventures and a unique 90th birthday gift from Judy’s grandsons.

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