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Where To Watch The Nature of Things Season 21

  1. 1Mount St. HelenOctober 8, 1980
  2. 2Cystic Fibrosis / Whooping Crane / Cold-Water SurvivalOctober 15, 1980
  3. 3The Bare Necessity / Manatees / LudhianaOctober 22, 1980
  4. 4Tar WarsOctober 29, 1980
  5. 5Alternate Car Fuel / Surface Tension / Science FairNovember 5, 1980
  6. 6Chinese Culture (1)November 12, 1980
  7. 7Modern China (2)November 19, 1980
  8. 8Survival Instincts of the Insect World / Sickle Cell AnemiaNovember 26, 1980
  9. 9Invisible AstronomyDecember 3, 1980
  10. 10Prenatal Diagnosis of Spina Bifida / AmniocentesisDecember 10, 1980
  11. 11One of the FamilyJanuary 7, 1981
  12. 12Structure of Birds Eggs / Newfound land OilJanuary 14, 1981
  13. 13Poisoned Playgrounds / CharlieJanuary 28, 1981
  14. 14High Altitude Physiology / The Vision of Galileo / Dust StormsFebruary 4, 1981
  15. 15February 2, 1981February 11, 1981
  16. 16Sri LankaFebruary 18, 1981
  17. 17Tar SandsMarch 4, 1981
  18. 18BlackflyMarch 11, 1981
  19. 19Foxes EarthMarch 25, 1981
  20. 20April 4, 1981April 1, 1981