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This page is open for those who wish to theorize, summarize, or speculate. (No links, please, unless they go to information-only pages).


37 Comments

  1. Melissa Padgett says:

    Thanks Glen! Nice to have this space.

  2. Lisle Daverin Blyth says:

    Great stuff Glen. It’s important to have this space. Please keep it clear of intolerance. People affected by the Hum suffer enough without being undermined for their views in such forums.

  3. Melissa Padgett says:

    Here’s the topic I’m eager to explore: When I place my ears fully underwater, for instance when reclining in a bath, I hear other sounds like a nearby radio and my own heartbeat, but I don’t hear the hum. This has been consistent for the 4 years I’ve heard the hum. I’m so curious: What are other hearers’ experience? And what could it mean if it appears water does block it? Thanks for any replies!

    • SGVH says:

      PS: Maybe it is simply the water-PRESSURE filling up/around/against the ears (&/or the entire head for that matter) that blocks the Hum vs. the substance (water) itself(?)
      (I’m thinking of cars that have crashed into rivers; they say the water-PRESSURE up against the car doors/windows is so strong you cannot open the doors so you’d have to break the windows with an ice-pick or something like that to “even out the pressure” to get yourself out of the car.)
      OTHER SUBSTANCES/ACTIONS THAT COULD CREATE “PRESSURE” (?):
      Anyone brave enough to try, bury their head in dry fluffy beach sand (temporarily of course &/or with a breathing-hose or tube sticking out of the sand) & see if the pressure of packed-sand up against head/ears would also block Hum(?)
      (Cheaper than building iron-clad or lead-clad VLF “caskets.” 😉 )
      ~~~
      I’m now remembering Lisa’s & others’ airline flights removing Hum temporarily for several days > It has to be the PRESSURE up against head-ears-body that subdues the Hum, Water Pressure &/or in this case high-altitude AIR Pressure.

    • SGVH says:

      I don’t know the reason, but some entrepreneur should make ear-plugs made with water in them vs. plastic, foam, gel, rubber, &/or whatever else ear-plugs are normally made of.

      A DIY experiment might be to take 2 small balloons, fill each with just enough water to fit in each ear, then tightly secure the ends with rubberbands (that end would stick out, not inside the ear). Then use a sports headband around the head & over the ears to hold the water-balloons in place inside the ears, & see what happens. 🙂

      Do you use anything in the bath water, like Epsom Salts, etc.? Or is it just pure/plain bath water?

      Comparison: I’ve read that MWR-RF cannot penetrate ocean (salty) water but plain water does not block it since MWs actually agitate/heat up regular plain water.

      So, whatever frequency the Mystery Hum is, maybe it is somehow unable to penetrate regular plain water the way MWs cannot penetrate salty water (?)

      • Jennifer says:

        I have been thinking the same thing…I’ve noticed that if I stick my finger in my ear it blocks/absorbs the Hum. While regular foam and wax earplugs are useless, I wonder if some earplugs that simulate flesh (gel or water or maybe something food-based) would work. How we would put it in our ears is another problem.

    • Charlie says:

      Hi Melissa, It was a while back and I don’t remember all the details, but I seem to recall someone on this site saying that putting the side of their head (ie.one ear) into water, stopped the Hum.

      I do remember trying this (on both sides), and my impression was that it had no effect at all. But I have never tried fully immersing my head.

      Anyway I’m curious about this one. So later on I shall run a bath, jump in and stick my head underwater and see what happens. I will report back.

      cheers

      • I think the under-water approach has little to offer. Even the slightest movement against the ear or ear canal will momentarily block the Hum, whether it be shaking one’s head or standing in the wind. I think it would take a tightly controlled experiment to investigate the water method.

    • Charlie says:

      Hi Melissa

      After reading your comment, I tried immersing my head in a bath (ie. both ears under water), but it didn’t seem to have a noticeable effect. In other words the Hum was still there.

      In view of SGVH’s comments I then dissolved about 50g of Epsom Salts in the water (approx. 200L). It didn’t make any difference. I could still ‘hear’ the Hum underwater. Maybe a stronger solution would do the trick?

      I do recall that a while back, someone on this forum mentioned that water could block the Hum for them. I’d have to ferret around in old postings to find this comment. Though, as I recall, they tried sticking one ear in a bucket of water… apparently that did the trick for them. It didn’t work for me though.

      cheers Charlie

      • Charlie says:

        Hi Glen, my apologies, I missed your post.

        The only potential ear canal disturbance that I have tried that seems to have any effect is Bernie’s Head Shake. And that was, at best, a subtle effect. So subtle in fact, that I hesitate to describe it as an effect at all.

        The head immersion thing had no effect, not subtle, not very shortlived. Nothing.

        You mentioned that “Even the slightest movement against the ear or ear canal will momentarily block the Hum, whether it be shaking one’s head or standing in the wind”. I don’t want to read too much into your remarks, but doesn’t this suggest that some physiological property of the ear canal is involved? This could well be the case for some, but in my case I’m yet to be convinced. That is, of course, barring my somewhat unconvincing results from BHS.

        cheers Charlie

      • Tinnitus can be masked if loud enough sounds are used. But then so can typical sounds, so the fact that a sound or perceived sound can be masked is not in itself diagnostic.

  4. Ann Ferguson says:

    Recordings of the Him can be found at:
    http://www.speechresearch.co.nz/hum.html

    • A few people, including myself, have tried to pursue aspects of this story. Moir’s replies were vague, generalized, and he did not follow up on several inquiries. Regarding his major claim that the Hum was recorded, that is not the case. A colleague of his recreated the noise, and Moir did not provide specifics. He claimed that the phrase “hum drum” comes from the Industrial Revolution, but he could provide no references. So as far as I’m concerned, his work in incidental, and adds very little.

  5. Debby says:

    HI Glen, thanks for creating an open thread. However it is frustrating that the comments are closed (again) on the previous post where I could respond to Henrik and Bernie’s response to my previous comment. Although some people may experience a hum that is otoacoustic, I believe what I am hearing is external, because I can go out of town and not hear it. And this is travelling roughly 15km on a relatively level road (no changes in air pressure). It also doesn’t explain why foil/aluminium can block it. And I have tried many times to match it to my heart beat and it is definitely out of sync with that.
    The ear plugs/air pressure changes block sound waves from outside the ear, (look up info about air pressure on ears) so it would have to be external. After a flight, your ears are temporarily closed up, and our hearing is affected, which would make a very low vibrational sound extremely difficult to hear.
    Interesting to know of the seismic/mechanical theory of the water glass test – perhaps there is something underground, industrial or a water pump that creates enough vibration to cause it? That would explain why I don’t hear it out of town, and it faded when the power was cut.

    • Henrik, to his credit, is limiting his commentary to his area of expertise. That thread is closed and will stay closed. As for tin foil and so on, this has long been discredited – or at least rejected, as a method of blocking the Hum. I’m quite finished with that. You are more than welcome to exchange with others, but not on Henrik’s post. Cheers, Glen.

      • Debby says:

        Thanks Glen, do you have info on an experiment that shows it as discredited? Could you provide a link? I’d like to compare what materials have been experimented with.

      • Tin foil is an interesting topic, and not only because metal foil is the very icon of clinical paranoia. The notion of foil blocking has been discredited through personal experience (not mine), more formal experiments, and theoretically. If you take a look through this blog, you’ll see a post specifically on this topic.

      • Debby says:

        As the Hum has been louder the past few days (as usually happens in cold weather), I tried a few more times with the emergency blanket and noticed, it isn’t blocking it, it just makes it ‘quieter’ – probably due to the warm air in the blanket and/or the static it produces. The last time I tried it, it was warmer weather and there were possibly other noises blocking it. The out of town locations I went to were very quiet, and I couldn’t hear the Hum, although I didn’t go in any house or building out there to see if the Hum was resonating, as it seems to do inside a building more than outside. I live 2km out of town (but still near industry etc) and the Hum is quite loud here (especially during winter!) so I will try and find a building somewhere in the ‘quiet zone’ next time I go there.

  6. With regard to whether or not water would block the Hum, I can’t think of how to do an uncomplicated experiment. In the general rendering of the basic suggestion, I speculate that water would block ordinary sounds but not the (likely otoacoustic) Hum. But how to prove this? Not so easy.

    In a case of a presumed external source of the Hum, we are talking about an acoustic vibration in air passing (or not) through water and subsequently reaching the hearing structures in the ear/brain. We might suppose that an experimenter is already (dry) hearing the Hum and has arranged for other sound sources to be on-call as well. The experimenter fills a basin with water, and tilting his/her head, dips an ear into it; just enough to block the access through the air (but by making sure the immersion is minimal), avoiding complications of excess pressure in the ear canal (pressure on the eardrum). [Note – air is trapped in the ear canal. ] However, doing this on both ears simultaneously is beyond anything I can imagine (strike one).

    Now, in a simplified view, we would have (acoustic) sound striking the surface of the water in the basin and being transferred to the liquid. This in turn would emerge at the water-air interface at the opening of the ear canal and proceed (through trapped air) to the eardrum, where it would be transferred by the middle ear (hammer, anvil, stirrup) to the inner ear (cochlea), ending up again in a liquid. The problem is the IMMENSE impedance mismatches of the THREE air/liquid interfaces. The middle ear is a famous, biologically implemented, impedance-matching transformer. But the other two are horrendously mismatched and EACH transmits less than 1% of the signal (strike two).

    [A fish story: Famously you can shout to your friends while fishing, and the sound never gets into the water. But don’t kick two rocks together in the water or you might as well go home. ]

    Even in the simplified view, there may be complications (like a resonance of perhaps a few kHz in the water-blocked ear canal). If one tries a real experiment, things will get ambiguous and confounded quite rapidly. Everything you do to try to solve one problem creates others. Using a bathtub? – is a bathtub an antenna? Partly submerged (head or whole body), is there hearing through body/bones etc., even if ears are blocked? What audio signals are used to test? If the Hum did seem to go away, did it come back dry? Way too many unknowns (strike three).

  7. Steve Kiley says:

    I am a sufferer and have left many comments on Youtube after the BBC produced a video “Have you heard the hum?” which is set in Bristol UK where I live.

    Two points. Firstly, I always hear the same note which seems to be between a C and a C# (checked against my electric piano). I am an amateur musician. I recently checked against an online tone generator, and it seemed to be about 68 Hz and a square wave.

    Secondly, a few weeks ago there was thunder and lightning in the night, which is not very common. After that, I could not hear the hum until a couple of days later.

    I first heard it back in the 90s, but have only noticed it again in the past year or so.

  8. Steve – good report – thanks

    The 68 Hz is consistent with the C to C# as you know. Your remark about using a square wave reminds me of a question I have answered by email to someone but I don’t think it was here on Glen’s blog. Paraphrased:

    ” You say that frequencies of say 50-70 Hz are very hard to hear. Middle C is 262 Hz, so these frequencies are just two octaves below middle C (which would be 65.5 Hz) and there is more that a full octave even below that on the piano, which I hear just fine. What are you saying??? ”

    Well, it is pure tones below about 100 Hz that start to get difficult. In contrast, supported by harmonics (as a piano string is, and tone generators are, if you use anything OTHER than a sine wave), the low pitches are quite audible. We don’t actually know what the waveform of the Hum is – no one has ever recorded/displayed it. (Happy to be proven wrong if so.) If we had to guess, it almost certainly has harmonics.

    The thunderstorm is curious. If you can remember the date well, were there any sharp changes of local barometric pressure (say half an hour duration, up or down) associated with the storm? Such might shake up the middle ear (speculation).

    Again thanks.

    Bernie

  9. George G. says:

    “—-were there any any sharp changes of local barometric pressure—–?”

    Excellent question Bernie.

    : Air Travel = Hum Null for several days, as reported by Hum sufferers who fly.

    And, thunderstorms are most certainly associated with rapid local barometric pressure fluctuations.

    Slowly but surely, logical conclusions are taking form.

    Good work everybody!

    G.

  10. Benoit Massin says:

    Hello everyone,

    I am Belgian, I am 48 years old and I am a sound technician.

    For information, this text has been translated into google, please excuse the translation defects.

    Since 2010 I have encountered health problems and discovered last January that they are related to infrasound.
    My spouse I met in 2013, who lives with me since 2014 and lived 500 meters behind my home, has been experiencing the same problems since 2010 as well.
    After a neighborhood survey, I found that my neighbors complain about the same degrading health effects except for those working more than 10 km from the city and those who take relaxing treatments like most seniors.

    After seven months of research I discovered that the origin of HUM comes from the frequency inverters.

    Experiment: Take a wall frequency inverter and connect a Led bulb.
    The drive in the maximum position will produce a stable current and the bulb will make a continuous light.
    As soon as we decrease the frequency of the dimmer the bulb will start to blink slightly as it receives an unstable current.
    Now, remove the bulb and replace it with a motor.
    The frequency converter in the maximum position will generate a maximum speed and stable behavior of the motor.
    As soon as we decrease the frequency of the drive the motor will start to vibrate as it receives an unstable current.

    This phenomenon is well known to those skilled in the art of variators, they are “harmonics” in the current decomposed by the frequency variation..

    What is the relationship with HUM?

    Here is the first source of Hum discovered:

    In our cities, where the population density per square kilometer is very high, there are a lot of large grocery stores.
    Over the last thirty years, refrigeration units have been increasingly placed on roofs to reduce noise, vibration and heat in shops.
    The cold rooms and refrigerator cabinets have quadrupled in volume in 30 years. Consequently, the refrigeration machines followed in size.
    As electricity became more and more widespread, electricity consumption had been increasing and a solution had to be found to reduce it.
    Electronic frequency inverters were then placed, which, in a ratio between the outside temperature and the inside, give a certain speed to the motor.
    Some stores have between 6 and 38 fans on the roof that have diameters of 60 to 100 centimeters each!
    Noise standards have been established for these devices but the infrasounds are inaudible by the human they have not been taken into consideration.
    In addition, the standards refer to the number of decibels per device and does not take into account the addition of decibels by the addition of devices!
    The calculation is the same for a speaker, whenever it is doubled the sound increases by 3db!
    Simple example: One machine = 60 db ^ 2 = 63 ^ 4 = 66 ^ …. 32 = 75 db! And I dare to imagine the number of decibels if you count several stores in the same city!
    Moreover if the shops are at the bottom of a valley, this one will amplify the sounds like a giant loudspeaker!
    It is for this reason that the people who live on the hills feel it more.
    All this explains why the people who describe the HUM speak of a motor or wind noise, we find both in a refrigeration group!
    In the case of several stores in the same city, infrasons with a range of several kilometers create a component of sounds that synchronize for a second and then desynchronize, resulting in the impression of a passing truck And goes away changing speed!
    This HUM continuously diffused by refrigeration units is very harmful because the vibration time of the nervous system is greater than the rest time, it increases all sorts of sensitivities in the body. The more we live in the “contaminated” ray by the infrasounds the faster we will be sensitive. The worst is the night, the “audible” sounds being greatly diminished our body perceives the infrasounds more continuously which aggravates the situation.
    Increased sensitivity for sinus, eyesight, hearing, nerves, muscles, joints. Nausea, tinnitus, excess tension, tight neck, headaches, migraines, light sleeper, tiredness, lack of concentration …
    I have been able to ascertain with certainty the source of infrasons from this source, between June 18 and 22, 2017.
    The outside temperatures were exceptionally between 28 °c and 35 °c, the refrigeration units rotated to the maximum, no harmonics and therefore no infrasound and no HUM!
    From Monday to Thursday, there are no ailments at the joints, head, neck, restorative sleep … Happiness!

    After acquiring a soundmeter specially designed for infrasound measurement, (Rion NL-62) I found in my home that the frequency that corresponded most to my feeling was 4 hz.
    When I went into town at night, I measured points from 83.7 db to 4hz for only 50 db above 20 Hz at the foot of a supermarket.

    After some research on the vibrations created by the harmonics, I discovered that these use the machines prematurely, after some time, one finds a deterioration of the ball bearings or play in the axes and cracks to the buildings … Therefore, From years to years the power of the infrasons increases.

    One solution would be to impose an annual inspection of the machines and check that they are fitted with quality anti-harmonic filters.

    • Lisle says:

      Benoit, this is interesting. Thank you. I don’t understand why the HUM is so loud far out of town, in rural areas and in the bush. No significant refrigeration. Here, in the city, there is a drone/rumble HUM, out of town it is
      higher, like an unguarded mic. But still with the oscellation, or irregular ‘dip’.

    • Good job investigating a case or what is apparently environmental noise due to cooling machinery. It seems, however, to be DIFFERENT in most every noted way from the widespread (often very far from grocery stores!) classic affliction known as “The Hum” that is discussed here.

      • Benoit Massin says:

        Thank you for your answers. If you align 50 speakers of 1000w each and send a powerful low-frequency sound, at night you will hear it more than 20 km and the last frequency you measured at the farthest will be in the lowest frequencies highest that you measured near the machines. Only one refrigeration machine is capable of this but the addition of all the machines of several supermarkets in the same city (56 in my city) can!
        In my research that lasted several months and often at night, I observed some phenomena : In my feelings, the closer I am to the set of machines, the more stable the HUM. The further I go, up to 20 km, the more variable it is.
        The device proved my feeling, close to the machines the wave was more linear and farther at the same frequency, the wave was less.
        Also, it is not only in the refrigeration units that one finds frequency inverters victims of harmonics. The pumps in the water catchment stations linked to huge pipes in the ground are also equipped and the power is adjusted according to the flow required to maintain a constant pressure. A powerful infrasound in a solid conduit or in pressurized water can be felt at tens of kilometers.

      • Benoit –

        Perhaps it would be helpful if you concentrated on observations and put off explanations/speculations till later. Like:

        (1) What pitch does your hum match to?

        (2) You and your spouse hear it. Who else, and under what circumstances?

        (3) Is it louder outside? How far from the markets do you hear it?

        (4) Does it interrupt for about a half second if you shake your head briefly or grunt?

        We need more details – you say you are a sound technician so technical details would be most helpful.

        – Bernie

    • JP says:

      Hi Benoit,
      Thank you for taking the time to write all this. Your description of the voltage fluctuation causing the sounf (as opposed to no sound running the motor in full throttle) reminded me of this text by Chris Barnes, please have a look: http://drchrisbarnes.co.uk/italy.htm

      Do you, or any other reader, have additional information on the electromechanical properties of commercial refrigerator motors compared to the Francis turbines in Barnes’s work? I’d be happy to hear any information. I’m a physicist myself, but lack an engineering background.

      Cheers,
      JP

      • Benoit Massin says:

        Hello JP
        We thank you for your comment and the shared link that proves once again that we are not far from the 4hz and that one of the main causes of Hum would be frequency converters. Around my house, within a radius of 5 kilometers, there are 11 wind turbines, 3 nuclear power stations, a hydroelectric dam, several sewage and feed pumping stations and 76 fans of the refrigerator unit with a medium diameter of 80 cm, of a chemical factory with several vertical and horizontal mixers … Practically all are regulated by frequency converters. All of these machines are between 20 and 40 years old, and except nuclear, none of the other installations are controlled and regulated by laws below 20 hz. Most of these machines work 7 days a week and 24 hours a day, they wear out, they vibrate … Last month, I did a lot of measurements with the Rion-NL62. I will communicate them in a few days to compare.

        Cordially

        Benoit

  11. Benoit Massin says:

    @ Bernie:

    1) It is more powerful above the machine level and is even more up the hill. The valley resonates the HUM and amplifies it like the cone-shaped membrane of a speaker. In freezing weather, it is even stronger because the vegetation becomes a more rigid material that better reflects the sounds.

    2) Of 30 people questioned in Hill 10 hearing it and 20 have health problems related to infrasound. Out of 10 people questioned at the bottom of the city, 2 hear it but none have health problems.

    3) It gives the impression of being stronger inside but it is not fair. It feels more indoors because the audible sounds are diminished!
    Take a quality noise helmet and it will be the same outside as you feel in your car or your home.
    After 3.2 km to the east of the refrigeration units, there is no more HUM. In the other directions there are other towns and villages that have shops, I have not yet tested the limits.

    4) There is no interruption if I make an effort or move my head.

    Other experience:

    My wife and I went some days to Italy before August 15th.
    Arrived at friends, no HUM. I remember falling asleep for a moment, I felt very relaxed. In the evening, we joined our hotel about fifteen kilometers away, a grand hotel, once in bed, the HUM was there!
    The next day in the morning looking out the window of the corridor I noticed the refrigerating units with 14 fans placed on the roof of the restaurant located on the ground floor.

    • Benoit –

      Thanks – ever so helpful. I would still like to know what pitch you (and others) match to. I saw a mention of 4 Hz for something, but not sure what.

      I am becoming quite convinced that what you are experiencing is real (acoustic) environmentally generated (locally strong) noise due to the BEATING of fans noises of slightly varying rates. Such first-order beating (amplitude) is well-understood and can be annoying:
      http://electronotes.netfirms.com/EN213.pdf

      Your analysis and experiments seem quite valid and are to be applauded, and address real concerns. However, this differs in most aspects from the “World-Wide Hum”.

      – Bernie

      • Benoit Massin says:

        In my research, I am very rational, at the base, before being a sound technician, I am an electro mechanic, I studied pumps, fluids, air flows … I approached everything could create a HUM, thanks to the World Hum Map Database, I proceeded by elimination. What is the machine in all these places marked with a red point ? If you analyze the map with a zoom, you will find that the high concentrations of red points are found where the population density is greatest, in large cities. Then take a closer look and you will see that these cities are all located on a river or ocean and there are few red points on the river. The greatest concentration of points occurs when the relief takes the altitude and these points decrease when the relief is less steep. The situation is the same every time. There are however some exceptions in the middle of nowhere, the people who have informed these isolated points may be a neighbor who has a worn air conditioning where are in a pool of water with a pump that vibrates and creates an infrason that spreads In water under pressure or resonates in large pipes with low unpressurized flow.
        With regard to the frequency of 4Hz, it is above all the spectrum that best corresponds to the sensation of the HUM. This does not certify that the World Hum is at 4Hz. The world Hum is variable in intensity and frequency, which corresponds to machines controlled by frequency variator. The frequencies and sound levels that the machines emit vary according to the speed of the motor and the number of machines. If you deviate from the machines, you must consider the resonance of the buildings and the relief. Closer to the machine, the “BEATING” will be more important provided that there is only one machine or several machines synchronized on a single variator If you move away from the machine, the relief resonance and the number of machines provide more stable infrasons. Most studies do not take this into account because they have been carried out in the laboratory and not in the field at various machines distances.
        The World HUM is a component of several sounds coming from the same type of source !

      • Benoit –

        There is nothing “wrong” with what you have presented. But I don’t think it has anything to do with the ongoing issue of the so-called “World Wide Hum”; – except as it is a real (acoustic) environmental noise of apparent infrastructure origin that is a distraction (similar to the Windsor Hum of a few years ago). All the evidence you relate is inconsistent with most of what we have investigated here.

        For example, the pitch is way too low (below 4 Hz compared to 50-100 Hz for The Hum); you can search out the source’s locality and travel away (but The Hum moves with us); and you apparently assemble tens of people nearby all of whom hear it (while most don’t hear the Hum at all even when coached). (Further, the concentrations of red-dots likely reflect a density of people who also own computers – not of sources.)

        I am guessing that you are NOT among the 1 in 50 people who hear The Hum. So you have to guess about what many of us “hear” (as of course we guess about what you are talking about!). In that, you are lucky! You (despite being a sound technician) have declined to report a typical Hum pitch in the 50-100 Hz range that “hearers” do clearly hear and match. So, am I right that you don’t hear it? Most of us who do hear it have almost certainly invested considerable effort in a futile search for any explanation as mundane as a refrigeration unit atop a nearby store.

        Feel free to email me as we are likely boring others here:

        -Bernie hutchins@ece.cornell.edu

  12. Benoit Massin says:

    Hello Bennie,

    Thank you for your answers.

    Observe the frequencies that most people who hear HUM have given.
    Frequencies range from 4 to 500 hz!

    https://fusiontables.google.com/DataSource?docid=1k0M6FS4o04CnQXynRHwUomymVwBBz0tzW491DvpR

    The waveform is heard by each of us differently with the sound generator.

    Most listeners, however, describe the HUM as a stopped car in front of the house or farther with a diesel engine idling.

    Experience:
    Click here and on “play”:

    Next, run the “Tone Generator Online”:
    http://onlinetonegenerator.com
    Set it to 4hz with a square wave. (Wave of disturbance by harmonics due to frequency generators)

    Finding: the two beats are pretty much the same and it’s not unpleasant!

    Now stop the diesel engine sound.
    Do you support the sound generator for a long time?

    It is helpful to applaud all people who have studied HUM until now, but have they found its source?

    Do not you think it would be worth watch into other tracks?

    I think it is helpful to discuss our views and experiences here with respect for all of us and if one of us has exaggerated on the subject, Dr. Glen MacPherson will point this out.

    I might be wrong, you may be right, but before you drop a track, you have to be certain that this is not the cause.

    If other people are reading this and have more resources to study this new track, how will it be explored without debate?

    Each of us is enriched by the experience of others.

    Cordially

    Benoit

  13. Carl says:

    The recent and ongoing mystery of the Cuban embassy american and canadian diplomats ill from sonic silent weapon story , proves that at least the militairy knows infrasound and microwaves can be weaponised to damage people , the sound emitted heard only by the brain of those targeted , and it causes damage , nausea , extreme headaches, tinnutus hearing loss , balance loss , and brain damage, while not damaging or being heard by others in the same house.

    So this is reason for concern in regards to past non disclosure of such weaponry- such devastating silent sound weapons only heard by the targets were considered conspracy stories of v2k targeted individuals.

    http://www.iflscience.com/technology/mysterious-sonic-weapon-attacks-cuba-stranger/

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