I am re-posting this article I found while investing the current hum. In 1959 the steel mill identified a ‘hum’, and they fixed it for the residents of Windsor. In 2014 it’s a totally different story. It’s been over four years, one assessment by Earth Quakes Canada, one test from NRCAN, and another test by acoustic engineers – and they still can’t pinpoint the hum! It’s evidently clear that the problem is based on something else all together.