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The People’s Republic turns 70 on October 1st. Mark Mardell tells the story of how much China has changed in those seven decades - politically, culturally and socially. In episode four, he looks at how China is harnessing new technology to achieve a surveillance state unlike any other, and why the so-called Century of Humiliation fires sensitivities that will underpin the anniversary celebrations. (Photo: Biometric Hardware firm displays security solutions Credit: Getty Images)