The Nature of Things

Season 1

25 Episodes

1960

Season 2

24 Episodes

1962

Season 3

24 Episodes

1963

Season 4

11 Episodes

1964

Season 5

11 Episodes

1965

Season 6

17 Episodes

1965

Season 7

17 Episodes

1966

Season 8

4 Episodes

1967

Season 9

14 Episodes

1968

Season 10

28 Episodes

1969

Season 11

15 Episodes

1970

Season 12

10 Episodes

1971

Season 13

10 Episodes

1972

Season 14

10 Episodes

1973

Season 15

8 Episodes

1974

Season 16

8 Episodes

1975

Season 17

8 Episodes

1976

Season 18

11 Episodes

1977

Season 19

0 Episodes

Season 20

0 Episodes

Season 21

0 Episodes

Season 22

0 Episodes

Season 23

0 Episodes

Season 24

0 Episodes

Season 25

0 Episodes

Season 26

0 Episodes

Season 27

0 Episodes

Season 28

0 Episodes

Season 29

0 Episodes

Season 30

0 Episodes

Season 31

0 Episodes

Season 33

0 Episodes

Season 34

0 Episodes

Season 35

0 Episodes

Season 36

0 Episodes

Season 37

0 Episodes

Season 38

0 Episodes

Season 39

5 Episodes

1998

Season 40

15 Episodes

1999

Season 41

19 Episodes

2000

Season 42

17 Episodes

2001

Season 43

1 Episode

2002

Season 44

1 Episode

2003

Season 45

23 Episodes

2004

Season 46

29 Episodes

2005

Season 47

24 Episodes

2007

Season 48

17 Episodes

2008

Season 49

18 Episodes

2009

Season 50

18 Episodes

2010

Season 51

18 Episodes

2011

Season 52

15 Episodes

2012

Season 53

19 Episodes

2013

Season 54

6 Episodes

2014

Season 55

2 Episodes

2015

Season 56

2 Episodes

2016

Season 57

6 Episodes

2017

Season 58

11 Episodes

2018

Season 59

17 Episodes

2019

Season 60

14 Episodes

2020

Season 61

14 Episodes

2021

Season 62

13 Episodes

2023

Season 63

14 Episodes

2024

Season 64

14 Episodes

2025

Season 65

13 Episodes

2025