Regenerative Health with Max Gulhane, MD

Hidden Health Costs of Screens and Artificial Light

• Dr Max Gulhane

In this talk I present the case that artificial light and wireless RF radiation are pervasive indoor pollutants that are disrupting your circadian rhythm and damaging the health of your children. 

Watch on Youtube to see the slides. 

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TIMESTAMPS
1:13 Framing The Health Problem
3:52 From Development To Physiology
4:52 Two Main Harms: Light And RF
6:06 How The Circadian Clock Works
11:02 Light Diet: Sun Vs LEDs
18:09 Evidence On Circadian Disruption
21:38 Wireless Radiation Concerns
26:43 Classrooms, ADHD, And Environment
31:12 Industry Warnings And Susceptibility
34:37 Reframing Light And RF As Pollution
36:36 Practical Daylight And Nighttime Habits
40:03 Device Limits And School Options

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DISCLAIMER: The content in this podcast is purely for informational purposes and is not a substitute for professional medical advice, diagnosis, or treatment. Do not disregard professional medical advice or delay in seeking it because of something you have heard on this podcast or YouTube channel. Do not make medication changes without first consulting your treating clinician.

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SPEAKER_00:

This is a talk that I gave at the Daylight Computer Kids launch in November of 2025. And the title is Health Harms of Technology. And in this presentation, I'm going to discuss my perspectives on why and how technology is impacting not only children, but also adults in today's world where so much of our time is spent inside under artificial light with devices. And really part of this talk is to discuss and offer a potential solution, which I think a good solution lies in the daylight computer. But let's dive deeply into why this image of an infant holding an iPad is not a good idea when it comes to the health of that infant and of that child. So there are many ways of thinking about what technology is doing to children and doing to uh growing brains. I think from a developmental point of view, the there there are real and negative effects on language and social emotional developing. I think you could argue certain in certain um contexts there might be cognitive benefits, especially if certain device certain games potentially can can assist in the cognitive acceleration of a child. But uh I think when when children are using either iPads or phones or technology to the exclusion or in the place of uh interactive drawing, social relating, socialization, playing outside, then you know this is going to have consequences and is going to direct that child developmentally down a different path that the ancestors and the map the vast majority of human generations prior had a developmental um upbringing. But that's not the topic of today's talk. I I really want to emphasize the physiological uh harms and what what potentially is happening to most people who are using devices most of the time. And again, there's there's lots of ways of of looking at this problem. I really want to emphasize two, and that is circadian rhythm disruption and radio frequency radiation or device the the radiation that's being emitted, the wireless radiation, in the course of the operation of these devices. But there there are many other ways of thinking about it, and I think eye health, um, obesity, metabolic health is is is really important and underappreciated relative to other causes of of this of obesity in this modern obesity crisis. But let's start with an overview of of the circadian rhythm, and this diagram explains a couple of points that I'm going to uh run you through. Uh essentially what's what's happening here is that that light, the presence of light, specifically in the blue wavelengths, is what is being turned into a neural signal that gets received by the hypothalamus uh in the brain, um specifically this suprachiasmatic nucleus, which acts as a master clock. And the the master clock is a projection, projects to various other brain regions to essentially coordinate or um trigger the certain uh pathways that are important for time-dependent operation. And what I mean by that is that in terms of um running our biological system, Mother Nature has realized that it is energy efficient and therefore most conducive to survival if the organism partitions different activities and different bodily functions to different parts of the 24-hour cycle. And that's a kind of technical way of saying uh we sleep when it's dark and we are active and we eat and we uh poop and we reproduce and we fight and we um converse and we socialize during the daytime. So these different functions again have been optimized for different times of day, and it and it actually coincides with things like the availability of light as an particularly as an energy source, um, and and the the role of light in terms of uh photometabolism, but but also um humans as essentially diurnal mammals um and the other advantages that that had. But uh what what this diagram is showing here is that the body uses light to entrain this uh master clock, and then using uh hormonal and neural signals, the master clock then projects to the peripheral tissues, i.e. the organs, like the lungs, like the heart, like the liver, like the intestines, like the kidney, um, like the muscle tissue, the adipose tissue, uh, etc., to run these peripheral clocks. And the the goal here is to synchronize these clocks. And the reason being is that the more uh synchrony there is between these peripheral clocks that are um programming the timing of peripheral functions, such as um the uh as say heart rate variability as blood pressure, as immune system um killing, or macrophage uh optimized function of macrophages or uh lipolysis um or um say the the function of the the alveolar surfactant production, whatever, whatever it is, you will be able to find um if you drill into the physiology of those peripheral tissues, you will find that there is a circadian function and a circadian time-dependent operation. Um so the the point being here is that the the body will run its own roughly 24-hour rhythm, but it requires these light signals, it requires the presence of correctly timed uh blue light, again, expecting it from natural sunlight and the absence of light to run things properly. And I I haven't found a better diagram to, I guess, pictorially depict this concept than uh this this yin and yang with a with a clock laid over it. And the the I think the one reason why, or many reasons why this is so relevant is because it implies this um equal and opposite um requirement for bright daylight and dark nights, which which should and traditionally and historically and evolutionarily have has only been illuminated by natural moonlight, which itself is a reflection of of sunlight, and but with a very um bounded spectrum and uh and and intensities. Um the the I guess way that we can also frame this need is that the intensity, the daytime intensity of of bright sunlight is orders and magnitude greater than what we can potentially generate from from artificial light indoors. Uh, and that is not something that we can replicate at all. And the nighttime is notably absent of street lights, it's absent of indoor lighting, um, which all are regular fixtures of today's modern built environment and today's modern lifestyle. So, what is the downstream consequence of this? Is circadian rhythm disruption. And circadian rhythm disruption is uh essentially the interference of the uh of the natural um of the body's 24-hour rhythm by mistimed or inappropriate uh lighting and activity and behavior, behavioral step um behaviors. So the the way that you can disrupt this circadian rhythm is by uh essentially getting inadequate or insufficient morning daylight. Um if you stay inside and you you don't get the um in terms of the intensity, the brightness of that blue light that is also balanced by by other wavelengths of natural sunlight, then the the magnitude of that circadian rhythm, the anchoring of that morning rhythm is does not occur or is is um is not appropriate. And then consequently, artificial light at night uh delays or prevents the onset of pineal melatonin. So the this uh contrast that we need and uh that feeds the cortisol melatonin rhythm, which are two two of the key hormonal messengers of um of light and darkness, uh to put to be put simply, and we could there's there's much more to be said about that, um, that that that process fundamentally doesn't uh go ahead correctly. And um really that can look and and in many different ways, but if you think about what most artificially lit classrooms are and all workplaces, is that they are essentially that. They are um devoid of the full spectrum of of natural sunlight, which varies in intensity it uh throughout the solar day, it is um present of ultraviolet and uh beyond visible red into the near and infrared light. And uh instead, people and children are sitting under unwavering, visible-only blue light. And this is this is a problem, again, for that reason. What about at nighttime? So outdoor light is something that you see in cities, in urban areas, in suburbs that have LED uh street lighting for you know safety and security reasons, but also devices which are self-luminous, they project blue wavelength light all over into the face and eyes of the user. Um, and and I'm I'm saying that to contrast against say something like this, the daylight computer, which is by virtue of its design uh having a very different effect and while still being able to be used and uh read and watched, and then something like an indoor indoor light use, which is ubiquitous in today's day and age. So the consequences of circadian rhythm disruption when we have this uh absence of of daylight at sunlight in the morning and throughout the day is that we're gonna we're not going to get the appropriate morning circadian cues. And that's gonna have downstream effects for things like fatigue, inattention, uh, particularly to say the least, and not to mention all those other bodily functions that require a strong morning signal, digestion, um, appropriate hunger signals, hormonal secretion, etc. etc. Whereas using devices at night, having an indoor or an outdoor light-polluted environment is going to suppress melatonin unnaturally. And it's just it's it's obvious, it's not rocket science. If we are showing our brain and our eyes and our master clock a blue rich signal that is typically or expectedly own expected only during midday or in uh in a in a key window during the during uh daylight, midday, uh early, um then that is going to trick the body into thinking it is daytime. And it will that melatonin suppression, which is an appropriate response to to the presence of blue light in the environment, is gonna cause absolute havoc for health because it's going to induce um, it's going to delay the sleep phase, it's going to delay the onset of sleep, it's going to del because it's going to delay the onset of melatonin um secretion. And therefore, it's going to not only reduce sleep quality, but it's also going to have all those other downstream effects that that occur when um due to misstiming, essentially. So, what what does what does this look like pictorially? Well, we can also frame what's happening with indoor and outdoor uh the modern light light changes with the spectrum. And and this is actually only displaying uh the visible spectrum from 400 to 700 nanometers, but you don't need to have training in in uh you know the physics of light to see the difference between natural sunlight and uh artificial LED and CFL light sources, um, and even and obviously incandescent too. But what what you note is that whenever blue or green light is present in in natural sunlight, it it's always present with an uh a longer wavelength. So it's present with the red and the infrared, and it it actually projects well past 700. Um and the majority of photons are actually in the near, uh in the infrared, um, essentially non-visible. So that that's a clue as to what is a healthy, well-balanced light diet. Uh, compare that to LED and compact fluorescent labs, which are, by virtue of their design, energy saving because they only emit in the visible spectrum. Um, this trade-off, this power-saving trade-off, means that they are highly, you can think of them as highly refined. They're the they're the high fructose corn syrup of lighting. And they that that uh unwavering, refined, visible-only signal um is is is going to essentially play havoc with biology uh for circadian reasons and and other reasons um related to mitochondrial function. The incandescent bulb, although it is an artificial short light source, it's it's actually a thermal light source. Um and the the way the light is generated by that bulb um through the heating of a filament and it leads to emission of a fair bit of heat and non-visible light. So, in terms of options, that is the least bad, and that's actually what what I'm actually lighting this uh this room up as I speak to you. So think about this and think about what light diet you and your children are ingesting in your modern indoor environment, because it's the equivalent of serving up high fructose corn syrup shots instead of eating a corn cob to use a food analogy. That's what's happening when we're stuck under artificial light with this visible-only spectrum, uh, deprived of UV, deprived of neo infrared, um, and uh under uh intense flicker, often uh flicker effect. So let's talk about what what does the research show? And and the the research is extensive, but I want to just really emphasize this paper because I I think it's a good summary, um, the health consequences of electric lighting lighting practices in the modern world, a report on the US National Toxicology Pro Program for workshop on shift work, uh shift work at night, artificial light at night, and circadian rhythm disruption. And essentially what what they cover or summarize in this paper is is how uh modern modern electric lighting practices which enable 24-7 work uh lead may lead to circadian rhythm disruption. And um and obviously they say here that sunlight and work at night are essential to society, making the identification of interventions uh challenging, but but the measures and of exposure to identify interventions to help public health are essential. So what are those those potential health effects? Well, really, the health effects of circadian rhythm disruption relate to essentially all the uh functions that circadian rhythms touch. So the corollary here is that if circadian function influences metabolism, uh brain health, uh the sleep-wake cycle, cardiovascular physiology, immune system function, then you can expect that all the disorders of those systems being dysregulated are going to be increased for those who have circadian rhythm disruption. Uh, for example, work shift workers, because they are the, I guess, the epitome or the case in point for circadian rhythm disruption, because they that's what they do for uh you know decades on end. And we have reams of data showing increased obesity, diabetes, cancers like breast, uh, colorectal, um, obstructive sleep apnea, hypertension, uh, sleep issues, um, uh depression and anxiety, um, impaired immune function. So those are the consequences of a cicading rhythm disruption. But I think the key point here is that we don't all need to be shift workers to be suffering these consequences because these are not binary outcomes. These are these are uh a spectrum, and everyone individual has different susceptibilities, and everyone uh has other, I guess you could call effect modifiers that either individually or together push people over the threshold into uh these different disease states. Um and again, it it comes back to those core fundamental functions of that are under circadian control in the body metabolism, immune system function, um stem cell depots. These are all uh high reproduction, are highly regulated by. Hacadian rhythms because the body timed them extremely uh efficiently based on light and their and an extension season because uh the photic signals vary not only on the on a 24-hour cycle, but also on an annual cycle based on the rotation of the earth around the sun. So, what what what else is going on in this classroom? Well, although it can't be seen in uh this image, there's also uh a way that these computers are communicating with each other. And perhaps this image is old enough that they were wired by by Ethernet LAN cables. But realistically, in today's day and age, um classroom, especially with wireless devices, are communicating through a tele telecommunications network that is based on radio frequency radiation and radio frequency transmissions. And the I think the the key point that I'm going to raise and that I will assert that is in opposition to the mainstream opinion, consensus, scientific narrative is relates to the health uh impacts of non-ionizing uh electromagnetic uh radiation. And really the the crux of this problem is that the engineers who and I guess government and regulators who are connecting society with cellular communication and with Wi-Fi networks, they're relying on this, I I guess you could call it an axiom that they that they hold, which is that uh non non-ionizing uh radiation, so in beyond uh in in in the while in the radio frequency range uh is un is not harmful, that this is the belief that they're based basing their uh regulation and and rules on, is it's not harmful unless it's at intensities uh sufficient to heat the tissue. And uh we if you if you take that um and and that's that's basically the the premise or the foundational viewpoint, if you take that, then at uh you can excuse or you can accept the use of things like uh Wi-Fi, 5G, etc., for fourth generation, um, fifth generation, Bluetooth in close proximity to human body, um, because according to that assumption, there's no health effect. But uh what these researchers, um Martin Paul, uh Professor Henry Lye, uh they have dedicated their careers to is to showing scientifically and providing evidence scientifically of the biological harm of this radio frequency wireless uh radiation in mammals. And and uh I would encourage anyone interested to to delve into this, but uh uh this is not a little amount of research. And the there's various reasons why research showing harm of of these forms of non-native EMF are is inconvenient. And I would say that the most obvious reason is because uh, again, the the economies are built on information technology and and digital communication, and it's extremely inconvenient if it turns out that that is harmful to human health. But really, it I I think it is, and this is potentially one of maybe 3,000 similar studies, uh rodent studies. And you know, these researchers used uh typical Wi-Fi emissions, so 2.45 gigahertz microwave radiation, uh i.e. just a Wi-Fi router. And uh they've said that it they found that it impairs learning, memory, and hippocampal synaptic plasticity in the rat. So what they found is that exposure to Wi-Fi for two hours per day for 40 days impaired um spatial learning and memory performance uh in this in this group. And and really, if we're thinking about what the modern classroom environment looks and exists as, then you have uh all these kids inside, as I mentioned, deprived of of natural circadian signals, and then potentially underneath uh or exposed to uh Wi-Fi at rates that potentially not as high, but probably um to some degree um comparable at some um intensity to say studies like these. And and if we think about the explosion of inattention in the form of attention deficit hyperactivity disorder, uh, you know, that that half of that um diagnostic criteria relates to inattention. And and you can imagine that uh, you know, what if their inattention was being driven by environmental cues? And specifically, uh what I assert is what what we can think of as environmental pollution by artificial light and by this radio frequency radiation. So, what about another way of thinking about it? I liked this paper. This was from a very recent study, and it was titled Increasing Numbers of Children Aged 5 to 19 years with memory problems in Sweden and Norway. So um, this was done between 2006 and 2024, and they essentially mined some clinical databases for consultations. I'm guessing these are primary healthcare presentations for uh presentations related to memory among children, five to 19 years uh per 100,000 inhabitants in Norway. And you know what you can see is that there's a central inflection point around 2019-2020, um, where you hear a steep projection up into the right. Um prior to that, there was more of a what looked like a gently increasing linear um increase in those presentations. But what the authors do uh is that they interpose the dates of introduction of various technologies in these groups. So you can see 2008 was the introduction of the first uh iPhone. Uh 2010, the rollout of 4G cellular communication. Um similar 2010 was the beginning, the use of Wi-Fi networks. Uh 2017 was the release of uh the Apple uh AirPods, uh, which use a Bluetooth um signal, and then from 2019 the rollout in the way of fifth generation telecommunications. So, you know, it's quite an interesting and yes, correlative uh um association, but I think that it's it's this re it's really speaking to uh what I think is is going to be a a causal relationship, and you know, we can go through, we can interrogate this with with the Bradford Hill criteria. Um the but really I don't think it needs to be essentially overthought. Um no adolescent um before 2017 in the history of humanity had uh a Bluetooth emitting device, um, you know, wireless devices that close to their head um until airpods are released. I mean, this this is again, it's it we don't have to overthink this. What about the iPhone? Um the iPhone, this is an iPhone Pro Max, uh and if you go to the regulation, the regulatory information in the actual device itself, um, it states and they the Apple can take gives you a uh disclaimer or a um statement about radio frequency exposure. And what do they say? They say actually to reduce exposure to RF energy, use a use a hands-free option uh such as the built-in speakerphone, headphones, or other similar accessories. Uh, cases with metal parts may change the RF performance of the device, including its compliance with RF exposure guidelines in a manner that's not been certified or tested. And you know, typically, as corporations are want to do, the the euphemistic use of RF energy, I mean radio frequency energy is radio frequency radiation. It just sounds better than than writing radiation. Um, but what what they're doing here is is absolving themselves of I guess you could call um lit litigious culpability or liability, or because they're essentially warning you that if you uh use your uh phone and you should and you put it next to your ear, or you use certain cases, then you might be exposing yourself to more RF radiation than you're supposed to. And uh I I think that's this is an admission that they're there by the manufacturer themselves, that there's there's a problem, there's an issue here. And if that is the case, then we need to be thinking about what what about children? What what is their differing susceptibility to say RF radiation, which absolutely they are more susceptible for various reasons, including their smaller body sizes. So um this is to say that there is a problem, let's not ignore it, but let's try and work, work, uh and find a solution. So I guess that one of the key takeaway points, and maybe the the most important takeaway point from my talk today, if you can take this with you, is that I really think we need to reframe artificial light at night um and wireless uh radio frequency radiation are as environmental pollutants. Um they are not you can't see them, you can't, well, you can see the artificial light, sure, but they're not uh most people aren't consciously aware of them. Um you can't smell them in the same way you could smell, say, a noxious gas. Uh, but they're having biological effects and they are changing the way the body is uh is is responding because it is fundamentally an alien environmental input that that the body's gonna try and uh mitigate and do do its best um with. So uh that the the question then is what what can you do? And I think the the solutions are very quite simple, but often it's it's gonna take quite a wholesale change. And uh unfortunately the the child, the infant, even the the the young child, they they can't do this by themselves. They actually the the changes to mitigate um the this artificial light at night and this this uh RF radiation involves essentially family lifestyle change. So what can we do is we can maximize healthy circadian signaling. That looks like going outside first thing in the morning, and instead of everyone flicking through a newsfeed or uh or an iPhone first thing, um the the family should go outside and stand on the grass and talk to each other, maybe, uh and play in in the early morning. And this will anchor the circadian rhythm. This will provide the the circadian cues for the body to to operate. Um nighttime, we want to minimize artificial light at night and do our best using things like uh warm color temperature lighting, um low luxe, low brightness lighting, um, positioning the lighting not overhead but at desk or below eye level. Um, and using again candles, red um lamps, even filament bulbs, incandescent, but uh ideally dimmed to get the the minimum amount of light we need to accomplish whatever task we need to do. That that's essentially how I think about it, and and try and minimize the brightness, but also the melanopically active blue light and green light that tells our body it's daytime. We also want to have things like consistent bedtime and bedtime routine that again helps with with circadian uh function and circadian reinforcing the circadian rhythm. And then look, when people do need to use devices, this is where it's pays to restrict the use of those devices. Um again, if if you if the child is at school and they're using them all day, well, this is there's I I completely disagree with that. And I think it's it reflects a regression, not a progression of modern education. Um, but you know, there's there's ways around it. Uh often they they might seem radical, but this is what you if you the child's health is staked, then there are alternative schooling methods that uh don't put your kid under a Wi-Fi router with a tablet from the age of six years old. Um avoiding their use first thing in the morning before natural sunlight, as I said, get outside first and avoiding them after the sun setting, especially if that's the dominant light source. Uh, because you're going to be blasting the brain um with blue light and again giving a daylight signal. The daylight computer, um, as we've uh briefly alluded to, is is one solution. And uh the the device's um display is actually uh absent of those blue wavelengths. So a very attractive option. And as I'll mention, you can use my code Dr.Max for a discount. What can you do as well for things like school? As as I said, I think without measurement, then people essentially you have no uh you're flying blind. So you know you can get and hire a uh EMF building biologist to assess the amount of RF radiation in the classroom, assess the spectrum that that your uh children are sitting under. And really, we need to be advocating against that as a an acceptable in environment for uh for for people, adults or children, children or adults, to exist in. And because long term, and yes, it's not gonna happen uh you know in one day, but the the the spectrum of health impacts that this chronic uh exposures are gonna have are are enormous. And yes, it it potentially um in some it might manifest as as ADHD, and then that that poor patient or that poor child gets uh you know medicated. Um, and then there's a there's a cycle that establishes if they're on a stimulant medication for ADHD, they they they can't sleep well, they're on screens late at night, um, and then they're uh you know wired but tired, the sleep is poor, and the whole process repeats itself, and then but behavioral issues uh come, and then next next thing they're being prescribed, you know, more stronger medications by by by uh by other you know, by the pediatrician who's at at a loss in terms of helping family manage that behavior, but it potentially is has its crux or its origin genesis in um a profoundly unnatural indoor uh environment and profoundly unnatural exposure, especially to to artificial light and and lack of of healthy sunlight exposure. And finally, yeah, advocating against um device use for especially primary age children. What are some other tips? So uh distance, distance from your body of things like phones and devices. Whenever I walk and I see someone, uh you know, a girl who has tucked her iPhone into her bra or uh literally um over her ovary, then you know, you what can you say? You can't say anything, but it's it's a tragedy because um, you know, that device is broadcasting, transmitting a Bluetooth Wi-Fi signal, and it's literally being absorbed by the tissue uh right underneath there and underneath. And um to think that this is biologically blind benign, I think is is uh hopelessly optimistic, or I would say um ignorant or yeah, wishful, wishful thinking. Reduce the time of exposure, avoid talking longer than necessary, reduce the time uh you spend in locations where many people are using cell phones close to each other, um, and they say here on public transit. The reason is because it's not only the Wi-Fi router that is emitting a signal, it's all the devices, the iPads, the phones, the tablets, the laptops that are actually interacting and broadcasting back. So if you have a classroom of kids and all of them are having a Wi-Fi connected um device or multiple, then then you're turning that that classroom into an absolute microwave. Again, not great. Um waiting for a good signal. Uh good signals mean your phone needs less power to connect and produces less radiation. What else? Turn things off when you don't need them using uh airplane mode, turn off Wi-Fi and Bluetooth when you don't need them. Um power off your phone and Wi-Fi router and other wireless devices at bedtime and at other times where they will not be needed for an extended period. A great, a great hack is especially if you have uh certain people who uh who get get up in arms if you turn off the Wi-Fi router is a timed uh PowerPoint plug. So you plug, you get it from any hardware store, it you set it to turn off between say 10 p.m. and um 6 a.m. And then it will just automatically cut power to that router uh over overnight. So that's that's an option. And use wired connections wherever possible. So use fiber optic cable or DSL internet services for your home or business. Use a wired connection such as Ethernet uh and make calls on land lines. Well, I'm not sure how many people have land lines anymore. Um, but yeah, I I have my computer right now attached to a hardwired to an Ethernet cable, so um it's faster, and I'm not able to turn on. Off the Wi-Fi broadcasting function of my computer. So all that to say is that where yes, it can seem overwhelming, but we we really need to think about this problem and start uh making taking steps to address it if we are going to protect the health of uh children in the next generation. So in closing, uh check out the daylight computer if you haven't already. Give it uh a blue light free display with a very very much reduced uh emission in of rate of RF radiation. And if you use code Dr.MaxDRMAX, you can get a US dollar fifty dollars off. So thank you for listening. And if you want to learn more, then head to the Regenerative Health Podcast. I've done several episodes on the topic of EMF um with Tristan Scott and others. And yeah, thank you for listening.