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- Season 0 1999-07-13
- Season 1 1974-03-03
- Season 2 1974-11-03
- Season 3 1976-01-04
- Season 4 1977-01-05
- Season 5 1978-01-04
- Season 6 1979-01-04
- Season 7 1980-01-15
- Season 8 1981-01-06
- Season 9 1982-01-10
- Season 10 1983-01-18
- Season 11 1984-01-17
- Season 12 1985-01-15
- Season 13 1986-01-21
- Season 14 1987-01-20
- Season 15 1988-01-19
- Season 16 1989-01-17
- Season 17 1990-01-09
- Season 18 1991-01-08
- Season 19 1992-01-14
- Season 20 1993-01-05
- Season 21 1994-01-18
- Season 22 1995-01-08
- Season 23 1995-10-10
- Season 24 1996-10-01
- Season 25 1997-10-07
- Season 26 1998-10-06
- Season 27 1999-10-05
- Season 28 2000-10-24
- Season 29 2001-10-02
- Season 30 2002-09-03
- Season 31 2003-09-30
- Season 32 2004-09-28
- Season 33 2005-09-20
- Season 34 2006-09-05
- Season 35 2007-10-09
- Season 36 2008-10-07
- Season 37 2009-10-06
- Season 38 2010-10-19
- Season 39 2011-09-07
- Season 40 2012-10-10
- Season 41 2013-09-11
- Season 42 2014-09-10
- Season 43 2015-09-16
- Season 44 2016-09-07
- Season 45 2018-01-10
- Season 46 2019-01-02
- Season 47 2020-02-05
- Season 48 2021-01-13
- Season 49 2022-02-01
- Season 50 2023-02-01
- Season 51 2024-01-31
Season 51 Episode
- Season 49 Arctic Sinkholes
- Season 49 Secrets in the Scat
- Season 49 Great Mammoth Mystery
- Season 49 Augmented
- Season 49 Determined: Fighting Alzheimer's
- Season 49 Dinosaur Apocalypse: The New Evidence
- Season 49 Dinosaur Apocalypse: The Last Day
- Season 49 Why Ships Crash
- Season 49 Ice Age Footprints
- Season 49 Ultimate Space Telescope
- Season 49 Saving Venice
- Season 49 Ending HIV in America
- Season 49 Computers v. Crime
- Season 49 Can Psychedelics Cure?
- Season 49 Ocean Invaders
- Season 49 Nazca Desert Mystery
- Season 49 Crypto Decoded
- Season 49 Zero to Infinity
- Season 49 Rebuilding Notre Dame
NOVA - Season 49 Episode 5 Determined: Fighting Alzheimer's
6.85 55 minutes Follow three women at risk of developing Alzheimer’s as they join a groundbreaking study to try to prevent the disease – sharing their ups and downs, anxiously watching for symptoms, and hoping they can make a difference.
