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(Male announcer) Thank you for downloading from the BBC.

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For details of our complete range of podcasts and our Terms of Use,

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go to BBCWorldService.com/podcasts .

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(Female announcer) Governments worldwide battle to control and contain terrorism.

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Police and the courts struggle to separate harmless loners from dangerous lone wolves.

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Opinions differ on the most effective way to combat terrorist attacks,

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from military interventions on the ground, to curbing political and religious radicalisation.

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But in this edition of Discovery, we'll be hearing about a more unusual new weapon

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that might be used in the future to fight terrorism:

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maths (1:00)