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- Season 0 2008-11-27
- Season 1 1960-11-06
- Season 2 1970-01-01
- Season 3 1970-01-01
- Season 4 1970-01-01
- Season 5 1970-01-01
- Season 6 1970-01-01
- Season 7 1970-01-01
- Season 8 1970-01-01
- Season 9 1970-01-01
- Season 10 1970-01-01
- Season 11 1970-01-01
- Season 12 1970-01-01
- Season 13 1970-01-01
- Season 14 1970-01-01
- Season 15 1970-01-01
- Season 16 1970-01-01
- Season 17 1970-01-01
- Season 18 1970-01-01
- Season 19 1970-01-01
- Season 20 1970-01-01
- Season 21 1970-01-01
- Season 22 1970-01-01
- Season 23 1970-01-01
- Season 24 1970-01-01
- Season 25 1970-01-01
- Season 26 1970-01-01
- Season 27 1970-01-01
- Season 28 1970-01-01
- Season 29 1970-01-01
- Season 30 1970-01-01
- Season 31 1970-01-01
- Season 33 1970-01-01
- Season 34 1970-01-01
- Season 35 1970-01-01
- Season 36 1970-01-01
- Season 37 1970-01-01
- Season 38 1970-01-01
- Season 39 1998-10-08
- Season 40 1999-10-04
- Season 41 2000-10-05
- Season 42 2001-10-02
- Season 43 2002-10-17
- Season 44 2003-10-22
- Season 45 2004-09-16
- Season 46 2005-08-31
- Season 47 2007-10-11
- Season 48 2008-10-16
- Season 49 2009-10-11
- Season 50 2010-09-23
- Season 51 2011-10-13
- Season 52 2012-10-18
- Season 53 2013-10-03
- Season 54 2014-10-09
- Season 55 2015-10-15
- Season 56 2016-10-06
- Season 57 2017-09-24
- Season 58 2018-09-23
- Season 59 2019-09-20
- Season 60 2020-11-06
- Season 61 2021-11-05
- Season 62 2023-01-06
- Season 63 2024-01-04
Season 63 Episode
- Season 49 A Murder of Crows
- Season 49 Mini Monsters of Amazonia
- Season 49 Broken Tail's Last Journey
- Season 49 Darwin's Brave New World: Origins
- Season 49 Darwin's Brave New World: Evolutions
- Season 49 Darwin's Brave New World: Publish and Be Damned
- Season 49 Suzuki Diaries: Coastal Canada
- Season 49 To Bee or Not to Bee
- Season 49 Bugs, Bones & Botany: The Science of Crime
- Season 49 The Downside of High
- Season 49 Bat & Man
- Season 49 My Nuclear Neighbour
- Season 49 Uakari: Secrets of the Red Monkey
- Season 49 One Ocean: Birth of an Ocean
- Season 49 One Ocean: Footprints in the Sand
- Season 49 One Ocean: Mysteries of the Deep
- Season 49 One Ocean: The Changing Sea
- Season 49 Masters of Space
The Nature of Things - Season 49 Episode 10 The Downside of High
7.50 48 minutes Is today's strong pot damaging young minds? That provocative question is at the heart of this new documentary on recent science discoveries about marijuana and mental illness.
