The Nature of Things
Season 13
Episodes
Episode 1
Nov 6, 1972
Episode 2
Nov 20, 1972
Episode 3
Nov 27, 1972
Episode 4
Dec 4, 1972
Episode 5
Mar 5, 1973
Episode 6
Mar 12, 1973
Episode 7
Mar 19, 1973
Episode 8
Mar 26, 1973
Episode 9
Apr 2, 1973
Episode 10
Apr 9, 1973