posted on Jan, 26 2012 @ 02:35 PM
There is a constant 'sound' in the air where I live, its called urban/industrial murmur, or background rumble/hum. It never ceases, its always
there, when local traffic slows in the middle of the night its more noticeable. This comes from air, rail, and highway traffic, 24-hour industry,
sewer system, even transformers on telephone poles and street light switches, and basic home infrastructure.