Image by law_keven via Flickrhttp://news.bbc.co.uk/2/hi/uk_news/8056284.stm
"For decades, hundreds of people worldwide have been plagued by an elusive buzzing noise known as "the Hum". Some have blamed gas pipes or power lines, others think their ears are faulty. A few even think sinister forces could be at work.
"The internet is abuzz with rumour and speculation. There are dark mutterings about secret military activity, alien contact and government cover-ups. The hum even featured in an episode of the sci-fi drama "The X-Files"."