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Year:
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| Original Air Date—15 September 2004
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| Original Air Date—22 September 2004
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| Original Air Date—29 September 2004
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| Original Air Date—6 October 2004
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| Original Air Date—10 November 2004
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| Original Air Date—17 November 2004
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| Season 1, Episode 7: AtlantisOriginal Air Date—24 November 2004
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| Original Air Date—1 December 2004
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| Original Air Date—22 December 2004
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| Original Air Date—8 December 2004
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| Original Air Date—5 January 2005
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| Original Air Date—12 January 2005
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| Original Air Date—22 January 2005
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| Season 2, Episode 4: TelepathyOriginal Air Date—16 February 2005
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| Original Air Date—10 March 2005
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| Season 2, Episode 6: SpacemenOriginal Air Date—29 August 2005
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| Season 2, Episode 7: BulletsOriginal Air Date—12 September 2005
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| Original Air Date—17 October 2005
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| Original Air Date—24 October 2005
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| Season 2, Episode 10: LandslidesOriginal Air Date—31 October 2005
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| Season 2, Episode 11: Loch NessOriginal Air Date—7 November 2005
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| Original Air Date—17 December 2005
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| Original Air Date—15 January 2006
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| Original Air Date—13 February 2006
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| Original Air Date—20 March 2006
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| Season 3, Episode 4: Big FreezeOriginal Air Date—29 March 2006
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| Season 3, Episode 5: Roman TechOriginal Air Date—26 April 2006
This "Roman Tech" episode illustrates a myriad of innovations the Romans developed before us: bikinis, strengthened concrete, sports arenas, central heating, window glass, double-paned windows, bathrooms, aqueducts providing clean tap water for a million citizens, sophisticated road systems, multi-story block apartments, surgical instruments, anesthetics and high-tech medical facilities. |
| Season 3, Episode 6: LightningOriginal Air Date—24 May 2006
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| Season 3, Episode 7: The DeepOriginal Air Date—28 June 2006
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| Original Air Date—5 July 2006
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| Season 3, Episode 9: PyramidsOriginal Air Date—12 July 2006
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| Original Air Date—19 July 2006
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| Original Air Date—6 September 2006
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| Season 3, Episode 12: Freeze MeOriginal Air Date—20 September 2006
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| Original Air Date—12 October 2006
We all know forensics makes good TV-but does it make good science? Stricter legal standards, combined with the advent of DNA analysis, have exposed the shaky scientific foundations of a number of forensic techniques. NGC takes a hard look at some of the most venerable forensic disciplines, fire investigation and firearms analysis, and asks whether the methods that make such good TV also make good science. |
| Original Air Date—21 October 2006
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| Season 3, Episode 15: ExtinctionOriginal Air Date—2 November 2006
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| Original Air Date—6 December 2006
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| Original Air Date—7 December 2006
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| Original Air Date—31 January 2007
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| Original Air Date—21 January 2007
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| Original Air Date—28 February 2007
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| Season 4, Episode 4: CometsOriginal Air Date—7 March 2007
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| Original Air Date—14 March 2007
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| Original Air Date—27 March 2007
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| Original Air Date—12 April 2007
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| Original Air Date—26 April 2007
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| Original Air Date—1 April 2007
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| Original Air Date—3 May 2007
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| Original Air Date—9 August 2007
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| Original Air Date—25 October 2007
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| Original Air Date—30 October 2007
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| Original Air Date—6 November 2007
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| Original Air Date—6 November 2007
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| Original Air Date—11 February 2008
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| Original Air Date—28 February 2008
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| Original Air Date—6 March 2008
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| Original Air Date—13 March 2008
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| Original Air Date—20 March 2008
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| Original Air Date—25 May 2008
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| Original Air Date—25 May 2008
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| Original Air Date—27 May 2008
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| Original Air Date—28 August 2008
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| Original Air Date—11 September 2008
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| Original Air Date—18 September 2008
Earth's magnetosphere, which shields us from deadly solar radiation is decaying rapidly. When it collapses, as Mars's did billions of years ago, Earth will be stripped of its atmosphere, water and life. This episode explores new evidence that the Earth's magnetic poles are on the verge of reversing. As it does, Earth's magnetosphere will weaken greatly for thousands of years, allowing solar radiation to penetrate to the Earth's surface. This will threaten many species, including man, with extinction. In 2010 three satellites will be launched to detect minute variations in field strength and identify any new areas of pole reversal. For mankind to survive, we must develop technological methods of protecting ourselves before this happens. |
| Season 5, Episode 12: Big BangOriginal Air Date—25 September 2008
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| Original Air Date—9 October 2008
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| Original Air Date—13 November 2008
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| Original Air Date—16 October 2008
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| Original Air Date—26 April 2006
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| Original Air Date—7 December 2008
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| Original Air Date—23 February 2007
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| Original Air Date—5 February 2009
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