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- S13.E1 ∙ Halley's Comet: Once in a Lifetime
- S13.E2 ∙ Goddess of the Earth: Gaia
- S13.E3 ∙ Horsemen of China
- S13.E4 ∙ Life's First Feelings
- S13.E5 ∙ The Case of the Frozen Addict
- S13.E6 ∙ Toxic Trials
- S13.E7 ∙ Skydive to the Rain Forest
- S13.E8 ∙ Return of the Osprey
- S13.E9 ∙ The Rise of a Wonder Drug
- S13.E10 ∙ When Wonder Drugs Don't Work
- S13.E11 ∙ Visions of Star Wars
- S13.E12 ∙ The Search for the Disappeared
- S13.E13 ∙ The Planet that Got Knocked on its Side
- S13.E14 ∙ High-Tech Babies
- S13.E15 ∙ Can AIDS Be Stopped?
- S13.E16 ∙ Is Anybody Out There?
- S13.E17 ∙ The Mystery of the Animal Pathfinders
- S13.E18 ∙ Are You Swimming in a Sewer?
- S13.E19 ∙ Sail Wars!
- S13.E20 ∙ Leprosy Can Be Cured!
- S13.E21 ∙ How Babies Get Made