NOVA - Season 51 Episode 21: Episode 21

Episodes: 10

Specials

1999-07-13

Episodes: 13

Season 1

1974-03-03

Episodes: 17

Season 2

1974-11-03

Episodes: 20

Season 3

1976-01-04

Episodes: 19

Season 4

1977-01-05

Episodes: 21

Season 5

1978-01-04

Episodes: 19

Season 6

1979-01-04

Episodes: 20

Season 7

1980-01-15

Episodes: 20

Season 8

1981-01-06

Episodes: 19

Season 9

1982-01-10

Episodes: 21

Season 10

1983-01-18

Episodes: 20

Season 11

1984-01-17

Episodes: 20

Season 12

1985-01-15

Episodes: 21

Season 13

1986-01-21

Episodes: 21

Season 14

1987-01-20

Episodes: 22

Season 15

1988-01-19

Episodes: 20

Season 16

1989-01-17

Episodes: 20

Season 17

1990-01-09

Episodes: 19

Season 18

1991-01-08

Episodes: 20

Season 19

1992-01-14

Episodes: 20

Season 20

1993-01-05

Episodes: 20

Season 21

1994-01-18

Episodes: 13

Season 22

1995-01-08

Episodes: 19

Season 23

1995-10-10

Episodes: 21

Season 24

1996-10-01

Episodes: 20

Season 25

1997-10-07

Episodes: 20

Season 26

1998-10-06

Episodes: 21

Season 27

1999-10-05

Episodes: 17

Season 28

2000-10-24

Episodes: 17

Season 29

2001-10-02

Episodes: 16

Season 30

2002-09-03

Episodes: 18

Season 31

2003-09-30

Episodes: 18

Season 32

2004-09-28

Episodes: 20

Season 33

2005-09-20

Episodes: 15

Season 34

2006-09-05

Episodes: 17

Season 35

2007-10-09

Episodes: 17

Season 36

2008-10-07

Episodes: 18

Season 37

2009-10-06

Episodes: 18

Season 38

2010-10-19

Episodes: 19

Season 39

2011-09-07

Episodes: 20

Season 40

2012-10-10

Episodes: 22

Season 41

2013-09-11

Episodes: 22

Season 42

2014-09-10

Episodes: 22

Season 43

2015-09-16

Episodes: 28

Season 44

2016-09-07

Episodes: 23

Season 45

2018-01-10

Episodes: 23

Season 46

2019-01-02

Episodes: 16

Season 47

2020-02-05

Episodes: 25

Season 48

2021-01-14

Episodes: 19

Season 49

2022-02-02

Episodes: 18

Season 50

2023-02-01

Episodes: 21

Season 51

2024-01-31

Episodes: 11

Season 52

2025-01-22