The Nature of Things - Unknown - Season 21

When available, episode names will be translated into your preferred language. Otherwise they will be shown using the series' origin language.

	Name	First Aired	Runtime
S21E01	Mount St. Helen	October 8, 1980 CBC	45
S21E02	Cystic Fibrosis / Whooping Crane / Cold-Water Survival	October 15, 1980 CBC	45
S21E03	The Bare Necessity / Manatees / Ludhiana	October 22, 1980 CBC	45
S21E04	Tar Wars	October 29, 1980 CBC	45
S21E05	Alternate Car Fuel / Surface Tension / Science Fair	November 5, 1980 CBC	45
S21E06	Chinese Culture (1)	November 12, 1980 CBC	45
S21E07	Modern China (2)	November 19, 1980 CBC	45
S21E08	Survival Instincts of the Insect World / Sickle Cell Anemia	November 26, 1980 CBC	45
S21E09	Invisible Astronomy	December 3, 1980 CBC	45
S21E10	Prenatal Diagnosis of Spina Bifida / Amniocentesis	December 10, 1980 CBC	45
S21E11	One of the Family	January 7, 1981 CBC	45
S21E12	Structure of Birds Eggs / Newfound land Oil	January 14, 1981 CBC	45
S21E13	Poisoned Playgrounds / Charlie	January 28, 1981 CBC	45
S21E14	The Moving Still	February 11, 1981 CBC	45
S21E15	Sri Lanka: Island of Serendib	February 18, 1981 CBC	45
S21E16	Tar Sands	March 4, 1981 CBC	45
S21E17	Blackfly / Desalination / Memory - Come to think of it / Dr. Karl Illmensee	March 11, 1981 CBC	45
S21E18	The Foxes' Earth	March 25, 1981 CBC	45
S21E19	The Last of Life / The Cajuns season finale	April 1, 1981 CBC	45

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