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But the problem is, we always have. The sun, cosmic background radiation, natural radioactivity... those are all a thousand times greater than the strongest human made radio signal. Every single day the sun pours more EMF radiation into every single square meter of the surface of the Earth than all the cell phones, broadcast towers and WiFi access points in the world. And unlike the EMF generated by any electronic device in our everyday lives those all, in part, are sources of ionizing radiation which can damage our DNA.
So if humans, outside of certain very rare diseases such as cutaneous or erythropoietic porphyria, aren't particularly sensitive to these very strong sources of electromagnetic radiation with which we evolved, why should anyone be even remotely sensitive to the much weaker human made ones?
Sure, in special circumstances, such as strapping strong electromagnets all over your head and then pulsing them in very particular ways, you can directly stimulate the human brain. But that's not the same as wearing a pair of headphones or putting a cellphone up against your head. The difference in the relative signals is great and since the strength of any radiation falls off as a function of the square of the distance, the effective radiation that actually reaches our brains is so weak as to be inconsequential.
No matter how one looks at this problem, there's no reasonable explanation for why anyone should be affected by the kind of electromagnetic radiation in our everyday environment. That doesn't mean there aren't people who are sensitive to it, but it does make them extraordinarily unlikely. And since the sun, CMBR, etc. are all so many orders of magnitude stronger, if there are such people then they would be sick with or without human generated radio frequencies. Which means the only way to alleviate their symptoms would be for them to live in thick lead lined faraday cages with no windows and only nonelectric sources of illumination. After all, the sun isn't going anywhere anytime soon.
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