Helps viewers of all ages explore the science behind the headlines.
| Season | From | To | Episodes |
|---|---|---|---|
| All Seasons | |||
| Specials | October 1983 | August 2024 | 42 |
| Season 1 | March 1974 | May 1974 | 13 |
| Season 2 | November 1974 | April 1975 | 17 |
| Season 3 | January 1976 | June 1976 | 20 |
| Season 4 | January 1977 | June 1977 | 19 |
| Season 5 | January 1978 | June 1978 | 21 |
| Season 6 | January 1979 | December 1979 | 19 |
| Season 7 | January 1980 | December 1980 | 20 |
| Season 8 | January 1981 | December 1981 | 20 |
| Season 9 | January 1982 | December 1982 | 18 |
| Season 10 | January 1983 | December 1983 | 21 |
| Season 11 | January 1984 | December 1984 | 20 |
| Season 12 | January 1985 | December 1985 | 21 |
| Season 13 | January 1986 | December 1986 | 20 |
| Season 14 | January 1987 | December 1987 | 22 |
| Season 15 | January 1988 | December 1988 | 22 |
| Season 16 | January 1989 | December 1989 | 20 |
| Season 17 | January 1990 | December 1990 | 20 |
| Season 18 | January 1991 | December 1991 | 19 |
| Season 19 | January 1992 | December 1992 | 20 |
| Season 20 | January 1993 | December 1993 | 20 |
| Season 21 | January 1994 | December 1994 | 20 |
| Season 22 | January 1995 | December 1995 | 17 |
| Season 23 | January 1996 | December 1996 | 20 |
| Season 24 | January 1997 | December 1997 | 20 |
| Season 25 | January 1998 | December 1998 | 20 |
| Season 26 | January 1999 | December 1999 | 16 |
| Season 27 | January 2000 | December 2000 | 21 |
| Season 28 | January 2001 | December 2001 | 19 |
| Season 29 | January 2002 | November 2002 | 15 |
| Season 30 | January 2003 | November 2003 | 17 |
| Season 31 | January 2004 | November 2004 | 18 |
| Season 32 | January 2005 | November 2005 | 14 |
| Season 33 | January 2006 | December 2006 | 17 |
| Season 34 | February 2007 | December 2007 | 15 |
| Season 35 | January 2008 | December 2008 | 18 |
| Season 36 | January 2009 | December 2009 | 17 |
| Season 37 | January 2010 | December 2010 | 17 |
| Season 38 | January 2011 | November 2011 | 18 |
| Season 39 | January 2012 | November 2012 | 16 |
| Season 40 | January 2013 | November 2013 | 24 |
| Season 41 | January 2014 | December 2014 | 23 |
| Season 42 | January 2015 | November 2015 | 21 |
| Season 43 | January 2016 | November 2016 | 20 |
| Season 44 | January 2017 | December 2017 | 21 |
| Season 45 | January 2018 | December 2018 | 17 |
| Season 46 | January 2019 | November 2019 | 23 |
| Season 47 | February 2020 | November 2020 | 16 |
| Season 48 | January 2021 | January 2022 | 22 |
| Season 49 | February 2022 | December 2022 | 19 |
| Season 50 | February 2023 | November 2023 | 18 |
| Season 51 | January 2024 | December 2024 | 18 |
| Season 52 | January 2025 | October 2025 | 16 |
| Unassigned Episodes | 8 |
| Season | From | To | Episodes |
|---|---|---|---|
| All Seasons | |||
| Specials | January 1983 | January 1984 | 14 |
| Season 1 | March 1974 | May 1974 | 13 |
| Season 2 | November 1974 | April 1975 | 17 |
| Season 3 | January 1976 | June 1976 | 20 |
| Season 4 | January 1977 | June 1977 | 19 |
| Season 5 | January 1978 | June 1978 | 21 |
| Season 6 | January 1979 | December 1979 | 19 |
| Season 7 | January 1980 | December 1980 | 20 |
| Season 8 | January 1981 | August 1981 | 10 |
| Season 9 | September 1981 | March 1982 | 20 |
| Season 10 | October 1982 | March 1983 | 16 |
| Season 11 | October 1983 | April 1984 | 21 |
| Season 12 | October 1984 | March 1985 | 22 |
| Season 13 | October 1985 | April 1986 | 21 |
| Season 14 | October 1986 | April 1987 | 21 |
| Season 15 | October 1987 | December 1988 | 31 |
| Season 16 | January 1989 | December 1989 | 20 |
| Season 17 | September 1988 | December 1990 | 21 |
| Season 18 | January 1991 | December 1991 | 19 |
| Season 19 | January 1992 | December 1992 | 20 |
| Season 20 | January 1993 | December 1993 | 20 |
| Season 21 | January 1994 | December 1994 | 20 |
| Season 22 | January 1995 | December 1995 | 22 |
| Season 23 | January 1996 | December 1996 | 20 |
| Season 24 | January 1997 | December 1997 | 20 |
| Season 25 | January 1998 | December 1998 | 20 |
| Season 26 | January 1999 | December 1999 | 16 |
| Season 27 | January 2000 | December 2000 | 21 |
| Season 28 | January 2001 | December 2001 | 19 |
| Season 29 | January 2002 | November 2002 | 15 |
| Season 30 | January 2003 | November 2003 | 17 |
| Season 31 | January 2004 | November 2004 | 18 |
| Season 32 | January 2005 | November 2005 | 14 |
| Season 33 | 0 | ||
| Season 43 | January 2016 | November 2016 | 20 |
| Season 44 | January 2017 | February 2017 | 4 |
| Season 45 | 0 | ||
| Season 48 | 0 | ||
| Unassigned Episodes | 384 |
| Season | From | To | Episodes |
|---|---|---|---|
| Season 1 | January 2005 | October 2018 | 6 |
| Unassigned Episodes | 1029 |
| Name | Number of Episodes | Dates | |
|---|---|---|---|
| Sarah Holt | 17 | 12/21/1999 - 04/13/2016 | |
| Liesl Clark | 16 | 01/18/2000 - 01/27/2016 | |
| Gary Glassman | 15 | 02/13/2001 - 10/17/2012 | |
| Julia Cort | 14 | 02/08/2000 - 11/16/2011 | |
| Chris Schmidt | 13 | 04/20/2004 - 10/14/2015 | |
| Michael Barnes | 12 | 02/01/2000 - 04/14/2009 | |
| Richard Smith | 12 | 04/10/2013 - 05/01/2013 | |
| Doug Hamilton | 11 | 04/17/2007 - 01/13/2016 | |
| Graham Townsley | 9 | 06/26/2007 - 09/16/2015 | |
| Joseph McMaster | 9 | 10/12/1999 - 11/13/2007 | |
| Kirk Wolfinger | 8 | 01/12/1999 - 12/28/2010 | |
| Rushmore DeNooyer | 8 | 11/14/2000 - 11/13/2013 | |
| Gail Willumsen | 8 | 01/03/2006 - 11/06/2013 | |
| David Murdock | 6 | 10/26/2011 - 02/17/2016 | |
| Ian Duncan | 6 | 12/11/2001 - 05/14/2014 | |
| Joseph Seamans | 6 | 03/28/2006 - 11/02/2010 | |
| Mark Davis | 6 | 02/15/2000 - 01/04/2005 | |
| Daniel McCabe | 6 | 02/04/2003 - 10/23/2013 | |
| Duncan Copp | 5 | 11/18/2003 - 01/02/2013 | |
| David Axlerod | 5 | 10/29/2002 - 10/04/2005 | |
| Larry Klein | 5 | 01/07/2003 - 01/30/2013 | |
| David Sington | 5 | 11/18/2003 - 01/20/2016 | |
| Thomas Lucas | 5 | 11/21/2000 - 10/31/2006 | |
| Elizabeth Arledge | 5 | 02/02/1999 - 01/27/2009 | |
| Michael Bicks | 5 | 02/09/2011 - 02/10/2016 | |
| Carl Charlson | 4 | 10/02/2001 - 02/22/2005 | |
| John Rubin | 4 | 02/19/2008 - 12/29/2009 | |
| Oliver Twinch | 4 | 04/06/2010 - 10/19/2011 | |
| Jon Palfreman | 4 | 04/18/2000 - 04/24/2001 | |
| Peter Chinn | 4 | 11/22/2005 - 01/11/2011 | |
| Jonathan Grupper | 4 | 02/18/2003 - 12/30/2008 | |
| Miles O’Brien | 4 | 10/09/2013 - 10/08/2014 | |
| Gisela Kaufmann | 4 | 04/03/2007 - 10/20/2009 | |
| Leslie Woodhead | 4 | 10/31/2000 - 11/06/2001 | |
| Nancy Linde | 4 | 02/22/2000 - 02/27/2001 | |
| Jeremy Llewellyn-Jones | 3 | 02/06/2001 - 09/03/2002 | |
| Paul Olding | 3 | 04/04/2006 - 02/05/2014 | |
| Stephen Lyons | 3 | 04/25/2000 - 02/06/2007 | |
| Peter Yost | 3 | 10/10/2012 - 01/23/2013 | |
| David Dugan | 3 | 01/08/2008 - 05/20/2008 | |
| Nathan Williams | 3 | 01/04/2012 - 01/08/2014 | |
| C. Scott Willis | 3 | 05/04/2004 - 02/03/2009 | |
| Louise Lockwood | 3 | 10/21/2008 - 06/30/2009 | |
| Terri Randall | 3 | 03/02/2010 - 07/13/2022 | |
| Peter Jones | 3 | 10/29/2002 - 04/13/2010 | |
| Gary Johnstone | 3 | 10/11/2005 - 11/13/2007 | |
| Mark J. Davis | 3 | 01/22/2002 - 02/26/2008 | |
| Caroline Penry-Davey | 2 | 11/22/2005 | |
| Mark Radice | 2 | 11/16/2004 | |
| Christopher Rawlence | 2 | 10/23/2001 | |
| Niobe Thompson | 2 | 09/26/2018 | |
| Tim Dunn | 2 | 01/18/2012 | |
| Nick Davidson | 2 | 04/01/2003 - 05/04/2010 | |
| Nic Young | 2 | 10/07/2015 | |
| Stephen Sweigart | 2 | 01/16/2001 | |
| Sonya Pemberton | 2 | 09/10/2014 | |
| Noel Buckner | 2 | 01/19/1999 - 02/03/2004 | |
| Ben Fox | 2 | 09/20/2005 - 09/26/2006 | |
| Joel Olicker | 2 | 10/19/1999 - 04/20/2004 | |
| Jonathan Challis | 2 | 04/18/2012 - 11/20/2013 | |
| John Hayes Fisher | 2 | 02/07/2006 - 01/06/2016 | |
| Llewellyn M. Smith | 2 | 02/06/2007 | |
| Henry Chancellor | 2 | 02/06/2001 | |
| Alice Harper | 2 | 09/28/2004 | |
| Lisa Quijano Wolfinger | 2 | 05/08/2007 | |
| Thomas Levenson | 2 | 09/29/2004 | |
| Nick Clarke Powell | 2 | 01/09/2013 - 04/02/2014 | |
| Gilles Cayatte | 2 | 10/14/2008 | |
| Mike Beckham | 2 | 04/03/2013 | |
| Adam Geiger | 2 | 05/07/2014 | |
| Nancy Porter | 2 | 10/12/2004 | |
| Sean Varley | 2 | 04/11/2012 | |
| Jamie Lochhead | 2 | 11/25/2015 | |
| David Lebrun | 2 | 04/08/2008 | |
| Louise Osmond | 2 | 02/28/2006 - 03/07/2006 | |
| Larkin Mcphee | 2 | 12/12/2000 | |
| Stéphane Bégoin | 2 | 01/12/2010 - 10/22/2014 | |
| Gary Hochman | 2 | 11/23/2004 - 12/28/2010 | |
| Iain Riddick | 2 | 02/13/2013 | |
| Alan Govenar | 2 | 11/23/1999 | |
| Chris Durlacher | 2 | 02/06/2001 | |
| Adrian Pennink | 2 | 02/01/2000 | |
| Hugh Thomson | 2 | 11/18/2003 | |
| Kenny Scott | 2 | 02/16/2011 | |
| Miles O'Brien | 2 | 02/20/2013 - 05/29/2013 | |
| Adam English | 2 | 02/06/2001 | |
| Scott Tiffany | 2 | 10/19/2010 - 10/17/2012 | |
| Bonnie Brennan | 2 | 02/17/2016 | |
| Malcolm Clark | 2 | 02/08/2000 - 04/27/2010 | |
| Guy Smith | 1 | 10/08/2014 | |
| Andy Awes | 1 | 11/07/2012 | |
| Alan Ritsko | 1 | 11/02/1999 | |
| Brian Breger | 1 | 11/07/2006 | |
| Jacinth O'Donnell | 1 | 01/20/2004 | |
| David Shadrack Smith | 1 | 09/07/2011 | |
| Graham Russell | 1 | 04/09/2014 | |
| Nick Green | 1 | 10/29/2014 | |
| Emily Roe | 1 | 12/18/2007 | |
| Jackie Mow | 1 | 10/07/2008 | |
| Ric Esther Bienstock | 1 | 02/06/1996 | |
| Richard Burke-Ward | 1 | 03/30/2011 | |
| Andreas Sawall | 1 | 12/26/2006 | |
| Brando Quilici | 1 | 10/26/2011 | |
| Dan Child | 1 | 11/09/2010 | |
| Talya Tibbon | 1 | 11/18/2012 | |
| Charles Coville | 1 | 11/24/2009 | |
| Chris Oxley | 1 | 11/15/2005 | |
| Herbert Habersack | 1 | 01/04/2000 | |
| Kate Bartlett | 1 | 01/11/2005 | |
| Mary Olive Smith | 1 | 05/13/2008 | |
| Gianfranco Pannone | 1 | 11/19/2002 | |
| James Brundige | 1 | 04/20/2016 | |
| Antoine de Maximy | 1 | 11/01/2005 | |
| Owen Palmquist | 1 | 02/02/2010 | |
| Chantal Hebert | 1 | 10/17/2006 | |
| Harvey Lilley | 1 | 04/06/2016 | |
| Tom Cook | 1 | 05/14/2014 | |
| Liz Tucker | 1 | 09/30/2003 | |
| Katie Bauer | 1 | 02/23/2011 | |
| Dick Bower | 1 | 01/22/2014 | |
| Martin O'Collins | 1 | 02/06/2013 | |
| Jerome Raynaud | 1 | 11/20/2007 | |
| David Chmura | 1 | 11/20/2013 | |
| Rick King | 1 | 02/24/2009 | |
| Celia Lowenstein | 1 | 01/21/2003 | |
| Graham Judd | 1 | 11/02/2011 | |
| David Huntley | 1 | 02/02/2011 | |
| Muffie Meyer | 1 | 02/15/2005 | |
| Lara Acaster | 1 | 03/29/2005 | |
| Susannah Ward | 1 | 03/27/2013 | |
| Julia Cort II | 1 | 11/04/2003 | |
| David Belton | 1 | 11/12/2002 | |
| Bill Jersey | 1 | 10/28/2008 | |
| Nigel Paterson | 1 | 10/16/2007 | |
| Kate Dart | 1 | 09/24/2014 | |
| John Aitchison | 1 | 02/14/2006 | |
| David Conover | 1 | 05/09/2000 | |
| John Bradshaw | 1 | 10/06/2009 | |
| Amy Bucher | 1 | 05/13/2008 | |
| Steven Latham | 1 | 04/24/2007 | |
| Peter Nicholson | 1 | 10/07/2003 | |
| Ricardo Preve | 1 | 02/02/2010 | |
| Ben Shackleford | 1 | 02/08/2012 | |
| Edward Hart | 1 | 01/29/2014 | |
| John Walker | 1 | 05/09/2000 | |
| Chad Cohen | 1 | 11/05/2014 | |
| Chris Hale | 1 | 02/22/2000 | |
| Jonathan Dent | 1 | 02/08/2005 | |
| Randall MacLowry | 1 | 11/09/2011 | |
| David McNab | 1 | 01/08/2002 | |
| John Wate | 1 | 10/09/2007 | |
| Nick de Pencier | 1 | 01/27/2009 | |
| Wolfgang Thaler | 1 | 01/04/2000 | |
| Eleanor Grant | 1 | 02/01/2012 | |
| Thierry Ragobert | 1 | 10/08/2002 | |
| Jo Locke | 1 | 11/18/2012 | |
| Ellen Hovde | 1 | 02/15/2005 | |
| Dimitri Doganis | 1 | 03/02/2004 | |
| Michael Jorgensen | 1 | 02/04/2003 | |
| Josh Rosen | 1 | 11/16/2011 | |
| Callum Macrae | 1 | 03/02/2004 | |
| Michael Schwarz | 1 | 10/28/2008 | |
| Tetsuji Miyagawa | 1 | 09/28/2011 | |
| Marco Visalberghi | 1 | 11/19/2002 | |
| Anna Lee Strachan | 1 | 02/10/2016 | |
| Noel Dockstader | 1 | 03/24/2009 | |
| Steve Greenwood | 1 | 02/13/2007 | |
| Robert Strange | 1 | 03/30/2011 | |
| Jemima Harrison | 1 | 11/14/2006 | |
| Ian Bremner | 1 | 11/12/2014 | |
| Peter Bate | 1 | 11/09/1999 | |
| Rob Whittlesey | 1 | 02/03/2004 | |
| Alex Williams | 1 | 03/29/2005 | |
| Mikael Agaton | 1 | 02/15/1983 | |
| Matt Barrett | 1 | 04/16/2014 | |
| Andrew Thompson | 1 | 04/23/2014 | |
| Sabin Streeter | 1 | 11/02/2011 | |
| James Barrat | 1 | 02/09/2010 |
| Name | Number of Episodes | Dates | |
|---|---|---|---|
| David Attenborough | 12 | 12/18/2000 - 12/25/2001 | |
| James Bamford | 3 | 02/12/2008 - 10/14/2015 | |
| Michael Scott | 2 | 02/05/2014 | |
| Matthew Collins | 2 | 11/23/2004 - 05/08/2007 | |
| Tug Yourgrau | 2 | 02/05/2002 | |
| Tom Shachtman | 2 | 01/08/2008 - 01/15/2008 | |
| Michael Winship | 2 | 11/21/2000 - 05/04/2004 | |
| Larry Klein II | 2 | 09/05/2006 - 04/24/2007 | |
| Jonathan Renouf | 1 | 01/30/2001 | |
| Thomas Friedman | 1 | 02/15/1983 | |
| Jeremy Hogarth | 1 | 12/18/2000 | |
| Christine Le Goff | 1 | 01/19/2010 | |
| Steven Reich | 1 | 01/05/2010 | |
| Martin Williams | 1 | 03/29/2005 | |
| Ronald H. Blumer | 1 | 02/15/2005 | |
| Claude Lazlo | 1 | 11/07/2006 | |
| Andrew Dean | 1 | 11/23/1999 | |
| Linda Harrar | 1 | 04/20/2016 | |
| John Goldsmith | 1 | 10/06/2009 | |
| William Hicklin | 1 | 04/04/2006 | |
| Vincent Liota | 1 | 10/30/2013 | |
| Andre Jurieux | 1 | 11/07/2006 | |
| David Espar | 1 | 02/22/2000 | |
| Jonathan Wickham | 1 | 10/24/2000 | |
| Timothy Smith | 1 | 09/07/2011 | |
| Wayne Dyer | 1 | 02/08/2012 |
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