The Nature of Things — Season 21

E01 Mount St. Helen 08 Oct 1980 E02 Cystic Fibrosis / Whooping Crane / Cold-Water Survival 15 Oct 1980 E03 The Bare Necessity / Manatees / Ludhiana 22 Oct 1980 E04 Tar Wars 29 Oct 1980 E05 Alternate Car Fuel / Surface Tension / Science Fair 05 Nov 1980 E06 Chinese Culture (1) 12 Nov 1980 E07 Modern China (2) 19 Nov 1980 E08 Survival Instincts of the Insect World / Sickle Cell Anemia 26 Nov 1980 E09 Invisible Astronomy 03 Dec 1980 E10 Prenatal Diagnosis of Spina Bifida / Amniocentesis 10 Dec 1980 E11 One of the Family 07 Jan 1981 E12 Structure of Birds Eggs / Newfound land Oil 14 Jan 1981 E13 Poisoned Playgrounds / Charlie 28 Jan 1981 E14 The Moving Still 11 Feb 1981 E15 Sri Lanka: Island of Serendib 18 Feb 1981 E16 Tar Sands 04 Mar 1981 E17 Blackfly / Desalination / Memory - Come to think of it / Dr. Karl Illmensee 11 Mar 1981