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Managing light to carry computer data, such as text, audio and video, is possible today with laser light beams that are guided along a fibre-optic cable. These waves consist of countless billions of photons, which carry information down the fibre across continents.

The year is 1974, and Harry Caul is monitoring a couple walking through a crowded Union Square in San Francisco. He uses shotgun microphones to secretly record their conversation, but at a critical point, a nearby percussion band drowns out the conversation