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Read this on Sophia Collins‘ Twitter timeline this morning and have been utterly fascinated by it.
In about 30 seconds after the news Radio 4 will have a programme in which Rebecca Morelle investigates the use of the background (almost inaudible, but capturable by clever people) hum that permeates every single sound recording ever made in ‘earshot’ of a plug, light fitting, fan, fridge, anything that is run on electricity and plugged in.


The hum that helps to fight crime

You can listen to the programme again here on BBC Radio 4.