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• S1.E1 ∙ The Making of a Natural History Film
• S1.E2 ∙ Where Did the Colorado Go?
• S1.E3 ∙ Whales, Dolphins, and Men
• S1.E4 ∙ The Search for Life
• S1.E5 ∙ Last of the Cuiva
• S1.E6 ∙ Strange Sleep
• S1.E7 ∙ Crab Nebula
• S1.E8 ∙ Bird Brain: The Mystery of Bird Navigation
• S1.E9 ∙ Are You Doing This for Me, Doctor?
• S1.E10 ∙ The First Signs of Washoe
• S1.E11 ∙ The Case of the Midwife Toad
• S1.E12 ∙ Fusion: The Energy of Promise
• S1.E13 ∙ The Mystery of the Anasazi
• S1.E14 ∙ Why Do Birds Sing?
• S1.E15 ∙ How Much Do You Smell?
• S1.E16 ∙ The Hunting of the Quark
• S1.E17 ∙ The Secrets of Sleep
• S1.E18 ∙ Inside the Golden Gate
• S1.E19 ∙ The Men Who Painted Caves
• S1.E20 ∙ Red Sea Coral