Damian Lewis stars as Niccolo Machiavelli - in the dock for his most provocative of books. File on 4 Clips
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Infectious diseases consultant: 'We don't know what to do next' Duration: 01:05 Superbugs
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The Rise of the Salafist movement Duration: 02:24 Recoiling the Arab Spring
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Undercover Cops Duration: 03:04 Undercover Cops
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Green on blue attacks raise questions about Afghan recruitment process Duration: 02:29 Green on Blue
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Islamic schools' child abuse risk Duration: 02:05 Madrassas
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Helen Watson on withdrawing treatment from her son Duration: 03:49 A Living Death
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My son was killed by a Taliban sniper Duration: 02:23 The Iran Connection
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Do we ever learn the truth about plane crashes? Duration: 03:57 Air Crashes
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Transplant recipient on getting cancer from donor kidney Duration: 01:00 Organs Failure?
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File on 4: A Soldier's Tale Duration: 02:51 Troops trauma
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File on 4: are banks bad for business? Duration: 03:05 Stingy banks?
