Each watch will have a unique identifying number, and the transmissions to each watch will be encrypted to protect the user's privacy.

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Shot predominantly in black and white, with spot colour for a Jewish child's red coat the film's unique identifying mark it recalls the tradition of post-war Italian neo-realism and the even older photographs of Roman Vishniac of Jewish life in Poland before the Nazis.

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Using a computer algorithm, the researchers focused on identifying unique genetic markers on the Y chromosome of men in the project.

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It's just one example of what's called biometrics, the process of identifying people by unique physical characteristics.

CNN: graphic

These unique markers can substitute for fingerprints in identifying people.

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