The Nature of Things — Season 11

E01 The Last Stand: Western Mountain Parks (1) 02 Nov 1970 E02 The Last Stand: The Everglades of Florida (2) 09 Nov 1970 E03 The Last Stand: Point Pelee (3) 16 Nov 1970 E04 The Last Stand: The Southwestern Desert (4) 23 Nov 1970 E05 A Sense of Time: The Age of the Universe (1) 07 Dec 1970 E06 A Sense of Time: The Age of the Earth (2) 14 Dec 1970 E07 A Sense of Time: The Age of Man (3) 21 Dec 1970 E08 The Great Lakes (1) 01 Feb 1971 E09 The Great Lakes (2) 08 Feb 1971 E10 Population Problems: Everybody's Baby (1) 15 Feb 1971 E11 Population Problems: Tomorrow's Child (2) 01 Mar 1971 E12 Who Help Themselves 15 Mar 1971 E13 Psychiatry: Heavy Night 22 Mar 1971 E14 Psychiatry: Street Fighting Mad 29 Mar 1971 E15 Psychiatry: Human Potential 05 Apr 1971