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Calgary - It's a noise that's been driving some residents in Ranchlands crazy for the past three years, but a team investigating the mysterious, low-frequency hum have still not tracked down the source.
The hum has been confirmed in at least 20 houses in the northwest community through testing with noise meters by University of Calgary sound engineers.
Residents first started noticing the noise in 2008, but at a community meeting held Wednesday volunteer investigators who've been working on the case for more than two years could only identify potential sources they'd ruled out.