The Nature of Things
Season 21
Episodes
Episode 1
Oct 8, 1980
Episode 2
Oct 15, 1980
Episode 3
Oct 22, 1980
Episode 4
Oct 29, 1980
Episode 5
Nov 5, 1980
Episode 6
Nov 12, 1980
Episode 7
Nov 19, 1980
Episode 8
Nov 26, 1980
Episode 9
Dec 3, 1980
Episode 10
Dec 10, 1980
Episode 11
Jan 7, 1981
Episode 12
Jan 14, 1981
Episode 13
Jan 28, 1981
Episode 14
Feb 11, 1981
Episode 15
Feb 18, 1981
Episode 16
Mar 11, 1981
Episode 17
Mar 25, 1981