The Nature of Things: Season 21
This season started on October 8, 1980. The table lists episodes with recorded air dates up to September 28, 2026.
| Ep | Title and air date | My place |
|---|---|---|
| 1 | Volcanoes / Hovercraft / Curve Balls / Windshear / Xerography | |
| 2 | Cystic Fibrosis / Whooping Crane / Cold-Water Survival | |
| 3 | Skin – The Bare Necessity / Manatees / Ludhiana | |
| 4 | Tar Wars | |
| 5 | Going Without Gas / Surface Tension / Science Fair | |
| 6 | China Now – Its Roots in the Past (Part 1 of 2) | |
| 7 | China Now – The Four Modernizations (Part 2 of 2) | |
| 8 | Success Story / Sickle Cell Anemia | |
| 9 | Freak Waves / Invisible Astronomy / Hildebrand | |
| 10 | Prenatal Diagnosis / Hearing in Chinchillas | |
| 11 | AAAS Report / One of the Family / Oyster Culture | |
| 12 | Birds' Eggs / Newfoundland Oil / John Polanyi | |
| 13 | Poisoned Playgrounds / Charlie | |
| 14 | The Moving Still | |
| 15 | Sri Lanka: Island of Serendib | |
| 16 | Blackfly / Desalination / Memory – Come to think of it / Dr. Karl Illmensee | |
| 17 | The Foxes' Earth |
