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Horizon

Season 1 • Episode 1
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Title : Horizon
Genre : Documentary
Overview : This Horizon episode is about the search for quarks, thought to be the substance of which electrons, protons, and neutrons are made of.
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December 25, 1966 Season 0 111 Episodes February 04, 1964 Season 1 9 Episodes January 06, 1965 Season 2 24 Episodes January 02, 1966 Season 3 23 Episodes January 17, 1967 Season 4 23 Episodes January 02, 1968 Season 5 24 Episodes January 02, 1969 Season 6 37 Episodes January 05, 1970 Season 7 37 Episodes January 04, 1971 Season 8 32 Episodes January 03, 1972 Season 9 33 Episodes January 04, 1973 Season 10 32 Episodes January 07, 1974 Season 11 33 Episodes January 20, 1975 Season 12 26 Episodes January 05, 1976 Season 13 30 Episodes January 07, 1977 Season 14 23 Episodes January 06, 1978 Season 15 24 Episodes February 26, 1979 Season 16 25 Episodes January 14, 1980 Season 17 25 Episodes January 05, 1981 Season 18 27 Episodes January 11, 1982 Season 19 22 Episodes January 10, 1983 Season 20 24 Episodes January 09, 1984 Season 21 22 Episodes January 07, 1985 Season 22 16 Episodes January 06, 1986 Season 23 22 Episodes January 05, 1987 Season 24 22 Episodes January 04, 1988 Season 25 25 Episodes January 09, 1989 Season 26 20 Episodes January 08, 1990 Season 27 20 Episodes January 07, 1991 Season 28 23 Episodes January 06, 1992 Season 29 19 Episodes January 04, 1993 Season 30 21 Episodes January 10, 1994 Season 31 21 Episodes January 09, 1995 Season 32 20 Episodes January 08, 1996 Season 33 16 Episodes February 27, 1997 Season 34 15 Episodes February 19, 1998 Season 35 18 Episodes January 28, 1999 Season 36 14 Episodes January 12, 2000 Season 37 19 Episodes January 25, 2001 Season 38 11 Episodes January 10, 2002 Season 39 18 Episodes January 09, 2003 Season 40 19 Episodes January 08, 2004 Season 41 18 Episodes January 13, 2005 Season 42 20 Episodes January 12, 2006 Season 43 19 Episodes March 13, 2007 Season 44 9 Episodes January 15, 2008 Season 45 17 Episodes January 26, 2009 Season 46 18 Episodes October 13, 2009 Season 47 14 Episodes September 27, 2010 Season 48 15 Episodes August 08, 2011 Season 49 13 Episodes July 23, 2012 Season 50 16 Episodes August 12, 2013 Season 51 11 Episodes August 18, 2014 Season 52 18 Episodes March 16, 2016 Season 53 16 Episodes January 19, 2017 Season 54 15 Episodes February 05, 2018 Season 55 13 Episodes January 23, 2019 Season 56 6 Episodes January 16, 2020 Season 57 8 Episodes January 04, 2021 Season 58 4 Episodes March 31, 2022 Season 59 4 Episodes July 22, 2024 Season 60 1 Episodes August 18, 2025 Season 61 4 Episodes