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A guide to all the latest gadgets, websites, games and computer industry news. The team look into how tech is being used to count and analyse the large-scale movement of people.

15 minutes

Last on

Sun 4 Oct 201521:45GMT
BBC News Channel BBC News UK & BBC News UK HD only

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26/09/2015

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10/10/2015

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Watch the full edition of Click

The 30 minute edition of Click is available on BBC iPlayer (UK only)