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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.

Amazing.

The hum that helps to fight crime
http://www.bbc.co.uk/news/science-environment-20629671

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