It creeps in slowly in the dark of night, and once inside, it almost never goes away.

It's known as the Hum, a steady, droning sound that's heard in places as disparate as Taos, N.M.; Bristol, England; and Largs, Scotland.

But what causes the Hum, and why it only affects a small percentage of the population in certain areas, remain a mystery, despite a number of scientific investigations. [The Top 10 Unexplained Phenomena (http://www.livescience.com/11345-top-te ... omena.html)]

Reports started trickling in during the 1950s from people who had never heard anything unusual before; suddenly, they were bedeviled by an annoying, low-frequency humming, throbbing or rumbling sound.

The cases seem to have several factors in common: Generally, the Hum is only heard indoors, and it's louder at night than during the day. It's also more common in rural or suburban environments; reports of a hum are rare in urban areas, probably because of the steady background noise in crowded cities.

So how many of you hear this hum?

River

Hmmmmmm. Interesting. Has anybody recorded the sound, or is it perceived only by human ears?

Sandi

Unless there are 19th Century descriptions -

My guess is <ta-da>

The "hum" is conducted vibrations from large factories far, far away.

Highly faulted areas are absent of "hum". The faults absorbing some vibration.

Some or special geostrata might conduct better then others.

I see no reason the source may not be thousands of miles away.

Again, all based on there being no 19th Century descriptions.

Moi

no, no hum here...

Well boys and girls, I think it's time you all knew the truth about River.

River is an alien. The hum is a coded message sent from his brothers in the galaxy of Andromeda to let River know his assignment on earth has been fullfilled and that they are coming to take him home.

Rupert is also an alien sent here to keep an eye on River.

Damn, now my secret is out,

The hum is from underground machinery digging tunnels for the Elite to hide in when Planet X/Nibiru comes. Or in this case, Comet ISON, which is really Planet X, but NASA is lying.

60 cycle AC electricity "hum" ?

I have always heard a hum. Always.

Usually I can drown it out with background noise, but occasionally when things are especially quiet, and there is nothing else to focus on, it can become almost deafening.

Once in a rare while, when the power goes out during the night, but there is no thunderstorm, I can really hear it to the point it can be very distracting. It seems to get louder. I don't perceive it as a vibration, or rumbling, but as a very low level hum. When I was a very young child I paid it much more attention than I do now. I used to try and hum in tune with it, especially at night, much to the annoyance of my parents.

I used to think it was background A/C vibration, but when it is quiet and the power goes out that is when I really hear it. It is like someone turns up the volume on it. The few times I have gone on remote camping trips, far from power lines and civilization, the louder it seems to be. Basically, the quieter and more still my surroundings, the more I hear it.

I have always assumed it is just the vibration of the hairs or tendrils of the inner ear. Maybe the hum is more likely heard by people who are used to a lot of background noise, and experience true silence for the first time. All they can hear is their own natural body vibrations and they assume it must be something from outside themselves, because they can't imagine just how imperfect their own body/hearing really is.

I wonder what the percentage of people are who can hear their own inner ear vibration, and how many have gone from noisy city environments to isolated rural ones. Maybe there really is no external hum at all.

Or,

Maybe I've been receiving alien signals all this time and have been ignoring their message. If so, they really ought to choose a more dynamic way of communication. That hum is rather boring, the way it just drones on and on.

I am sure that it is just the inner ear, and people's modern inexperience with true silence. Anyone have a better theory... Other than aliens and secret government bases under the whole world?

I didn't mean A/C appliances and their workings but rather Terran conducted 60 cycle.

Somehow, maybe with all those ground wires, the Earth transmits the A/C "hum" .

I guess my faults idea is not correct because you live amongst the faults, don't you?

Or do you live in the vast, faultless center?

Moi