Season 13

1.Halley's Comet: Once in a Lifetime

2.Goddess of the Earth

3.Horsemen of China

4.Life's First Feelings

5.The Case of the Frozen Addict

6.Toxic Trials

7.Skydive to the Rain Forest

8.Return of the Osprey

9.The Rise of a Wonder Drug

10.When Wonder Drugs Don't Work

11.Visions of Star Wars

12.The Search for the Disappeared

13.The Planet that Got Knocked on its Side

14.High-Tech Babies

15.Can AIDS Be Stopped?

16.Is Anybody Out There?

17.Mystery of the Animal Pathfinders

18.Are You Swimming in a Sewer?

19.Sail Wars!

20.Leprosy Can Be Cured!

21.How Babies Get Made