^ *gets all serious*
Where is this building located? Exactly what city? I enjoy all evidence other fellow believers capture, and experience. I would love to share your information with the GAC.































































































In the engineering building where Tandy worked, cleaning staff as well as fellow researchers complained of feeling dread, depression and a strange feeling that someone was watching them. But what made the situation really worthy of a Scooby-Do episode was the fact that every so often the staff would see dark figures out of the corners of their eyes. Now we're talking.
After one particularly strange experience when a gray shape sat next to his desk for several minutes, Vic Tandy was determined to figure out what the hell was going on. Being a man of science, he was going to skip the part where he had an exorcist come and bless the facility.
After eliminating gas poisoning and rogue equipment, Vic realized that the ghostly apparitions seemed to almost always occur in a certain section of the lab. He also realized that if he put a metal sheet in a vice, it would spontaneously vibrate uncontrollably for no apparent reason. Poltergeist, right?
No. Just infrasound.
Specifically, a "silent" exhaust fan was sending out low frequency vibrations that bounced back and forth on the lab's walls until they formed a powerful wave at... 18.9Hz. Right at the top of the panic range.
And, according to a NASA study, it was powerful enough to resonate with the average human eyeball, causing "smeared" vision. This is a phenomenon where the eye vibrates just enough to register something static -- say, the frame of your glasses or a speck of dust -- as large, moving shapes.
Predictably enough, once the vibrating fan was removed, the strange apparitions and feelings of fear disappeared.


































What he had discovered, aside from an awesome new way to torture interns, was infrasound. It's noise at a low enough frequency that you don't consciously hear it, but your ears still sense it. The process of receiving sensory input without your conscious mind understanding where it's coming from wreaks havoc with your emotions. Specifically, researchers found that sounds between 7 and 19 Hz it could induce fear, dread or panic.
































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