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Season guide

The Nature of Things: Season 21

17 episodes Premiered Oct 8, 1980 Updated Oct 3, 2026
Previously on The Nature of Things

Season 21 Lore Primer

Key plot threads, lore context, and character stakes you need to remember before diving into this season.

  • ⚡ Directly follows the overarching narrative developments of The Nature of Things Season 20.
  • ⚡ Faction dynamics and core character alliances shift under escalating external stakes.
  • ⚡ Crucial mysteries introduced previously reach key turning points and narrative reckonings.
  • ⚡ Sets up serialized story arcs that build directly toward the climactic season finale.
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Season 21 Episodes

Episode Guide

🛡️ SPOILER SHIELD

Season 21 Progress Shield

Future titles & synopses blurred. Tap "Reveal" on any card to peek.
Binge Efficiency Engine

Season 21: Filler vs. Essential Canon

Filter episodes by narrative weight. Focus on essential mytharc and skip standalone side quests.

29%
71%
Mytharc (5): Crucial lore & season climaxes
Core (12): Character development & subplots
Side Quest (0): Standalone / filler
S21·E3 Core

Skin – The Bare Necessity / Manatees / Ludhiana

Oct 22, 1980

Three films are featured: Skin – The Bare Necessity, dealing with the human skin; Manatees, concerning a unique vegetarian creature which lives in coastal waters, and Ludhiana, a p

S21·E4 Core

Tar Wars

Oct 29, 1980

The geology and relative impact of the Athabasca Tar Sands are examined, along with the problems involved in the extraction of oil from the deeper deposits

S21·E5 Core

Going Without Gas / Surface Tension / Science Fair

Nov 5, 1980

Going Without Gas: A look at recent developments in designing cars that run on fuels other than petroleum, such as methanol, ethanol, electricity, hydrocarbons and hydrogen. Surfac

S21·E6 Mytharc

China Now – Its Roots in the Past (Part 1 of 2)

Nov 12, 1980

The lifestyle and culture of modern China are highlighted in a study of the educational system and medical techniques of the country; visits to the seaport of Qingdao and the ancie

S21·E7 Mytharc

China Now – The Four Modernizations (Part 2 of 2)

Nov 19, 1980

The professional and recreational activities of the Chinese people are examined in a tour of their homes, factories and parks, as well as the palaces which were formerly the homes

S21·E8 Core

Success Story / Sickle Cell Anemia

Nov 26, 1980

A magazine edition: Success Story: a film by nature photographer John Carey about the insect world and the ability of insects to survive hostile forces of man and nature. Sickle Ce

S21·E9 Core

Freak Waves / Invisible Astronomy / Hildebrand

Dec 3, 1980

Freak Waves: A report on work at the Canadian National Research Council into wave formations that can engulf oil rigs or large vessels, even when weather conditions are relatively

S21·E10 Core

Prenatal Diagnosis / Hearing in Chinchillas

Dec 10, 1980

Prenatal Diagnosis: Presents new techniques to examine the fetus while still in the womb to determine its sex and detect possible defects. Hearing in Chinchillas: A look at the sim

S21·E11 Core

AAAS Report / One of the Family / Oyster Culture

Jan 7, 1981

AAAS Report: Scientists gathering in Toronto for a meeting of the American Association for the Advancement of Science are interviewed about the role of the scientific community in

S21·E12 Core

Birds' Eggs / Newfoundland Oil / John Polanyi

Jan 14, 1981

Birds' Eggs: A look at the many ways that egg shells protect and aid embryonic development of birds. Newfoundland Oil: The technical difficulties and possible environmental and soc

S21·E13 Core

Poisoned Playgrounds / Charlie

Jan 28, 1981

The actions taken by Ontario parents when insecticide spraying at a school proved hazardous to their children's health are examined, and in a repeat showing of the film "Charlie",

S21·E14 Core

The Moving Still

Feb 11, 1981

A look at the history of scientific photography from its beginnings in 1837 to the present-day use of high-speed cameras

S21·E15 Core

Sri Lanka: Island of Serendib

Feb 18, 1981

A documentary on Sri Lanka, its wildlife and culture and the changes taking place as technological development erodes traditional ways of life.

S21·E17 Mytharc

The Foxes' Earth

Mar 25, 1981

For centuries the people of the village of Huasicancha in Peru lived under the domination of others, from the last of the Inca rulers to the Spanish conquerors and subsequent regim

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