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- 1In the BalanceSeptember 24, 1969
- 2Urban CrisisOctober 1, 1969
- 3Water PollutionOctober 8, 1969
- 4Air PollutionOctober 15, 1969
- 5PesticidesOctober 22, 1969
- 6Danger Men at WorkOctober 29, 1969
- 7The Ages of Man A Day in the Life of a G.P. (1)November 5, 1969
- 8The Ages of Man A Breath of Life (2)November 12, 1969
- 9The Ages of Man The Attack on Cancer (3)November 26, 1969
- 10The Ages of Man (3)December 10, 1969
- 11The Ages of Man The Cell (5)December 17, 1969
- 12The Ages of Man Arthritis (6)December 24, 1969
- 13The Ages of Man Science Decade (7)December 31, 1969
- 14The Ages of Man Heart Disease (8)January 7, 1970
- 15The Ages of Man Transplants (9)January 15, 1970
- 16The Ages of Man A Definition of Death (10)January 22, 1970
- 17A Sense of Time The Age of the Universe (1)December 7, 1970
- 18A Sense of Time The Age of the Earth (2)December 14, 1970
- 19A Sense of Time The Age of Man (3)December 21, 1970
- 20Continental DriftMay 21, 1970
- 21Sense SubstitutionMay 28, 1970
- 22Physical Sciences Stellar EvolutionJune 4, 1970
- 23Physical Sciences Making WavesJune 11, 1970
- 24Physical Sciences Energy ConversionJune 18, 1970
- 25Physical Sciences LaserJune 25, 1970