“The presence of magnetite in the brain could be more than incidental. Various studies have shown that brain cells respond to external magnetic fields. There’s also a disturbing link to neuro-degenerative disease. Evidence exists of elevated levels of magnetite in brain tissue from Alzheimer’s disease patients.”
R. Mark Wilson — Physics Today (August 30 2018)

September 12 2018 — Stuart Gilder and Christoph Schmitz — both at the Ludwig-Maximilians University of Munich — have carried out the first systematic mapping of magnetite nano-particles in the human brain. Follow us on Twitter: @INTEL_TODAY
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“Man has conquered the Black Plague, but he has created new problems — EMF pollution.”
Dr. Yuri Grigoriev
UPDATE (September 20 2021) — In a new study, Chinese scientists found that a kind of magnetite Fe3O4 nano-particles (Fe3O4 NPs) induces severe endoplasmic reticulum stress and activates cancer apoptosis under the microwave irradiation.
[Magnetite Fe3O4 Nanoparticles Enhance Mild Microwave Ablation of Tumor by Activating the IRE1-ASK1-JNK Pathway and Inducing Endoplasmic Reticulum Stress]

Many animal species, from bacteria and birds to turtles and bats, have the ability to sense the Earth’s magnetic field.
Although it has long been suspected that the human brain can also sense magnetic fields, this ability was not clearly demonstrated until 2019.
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In an extremely carefully controlled experiment, Caltech scientists demonstrated that alpha brain waves respond to changing magnetic fields. [Can Humans Sense Magnetic Fields?]
Study coauthor Joseph Kirschvink, a geo-biologist at Caltech, interprets the dip in the alpha waves as the brain “freaking out” upon realizing that the magnetic field has moved while the body didn’t.
“The sense is there,” says Kirschvink. The question is, how does it work? “It demands that there are receptor cells, most likely with little crystals of magnetite in them conveying this information to the brain,” he says.
Russian biophysicist Yuri Grigoriev was one of the top experts in the field of electromagnetic health and safety. Grigoriev died in Moscow on April 6 2021 at the age of 95.
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Grigoriev promoted the idea that microwave biology is more complex than simple tissue heating. His own research has demonstrated the importance of modulation characteristics.
Indeed, Grigoriev pointed out that a modulated microwave carrier field can sometimes elicit an effect in situations where an unmodulated carrier wave of comparable energy density yields nothing.
Kirschvink noticed long ago that magnetite might provide a simple and elegant solution to this puzzle.
In a modulated microwave field, the amplitude of the crystal vibrations will vary according to the modulation. Thus, the acoustic wave that is generated will contain components at both the carrier-wave and the modulating frequencies.
These ought to propagate quite differently through the surrounding intra-cellular medium and could reasonably lead to different effects.
END of UPDATE
“They found magnetite concentrated in the same places in all seven brains — primarily in the cerebellum and brain stem. A striking asymmetry also exists in the distribution of particles between the right and left hemispheres.”
R. Mark Wilson — Physics Today (August 30 2018)
This investigation strongly suggests that magnetite is formed bio-genically. The magnetic nano-crystals are concentrated primarily in the cerebellum and brain stem, among the oldest parts of the organ. So what?
Magnetite is a ferromagnetic material. Through a mechanism known as “Ferromagnetic Resonance”, magnetite crystals are some of the best known absorbers of microwave radiation.
The exact resonance frequencies at which these crystals will absorb microwave radiation will depend on several factors, but the expected range is about one to two GHz.
Once absorbed by the nano-crystal, the energy will be first released through the well understood “magneto-acoustic” effect. So, if the RF signal is modulated, the cell will be exposed to the frequencies of the modulation.
Next, the cell will be exposed to heat stress and its protecting membrane will seriously be put to test, quite possibly allowing the leak-in of dangerous elements, causing DNA damage and eventually cancer to the medium.
It is rather obvious that the presence of magnetite in the human brain can explain all the “bizarre allegations” regarding the microwave effects on the human brain. ( And evidence exists of elevated levels of magnetite in brain tissue from Alzheimer’s disease patients.)
The frequencies used by the Russians against the US Embassy in Moscow in the 1960s were about 1 and 2 GHz, exactly the top frequencies expected for resonant absorption by magnetite. And the frequencies used today by Telecom industry are about 1 and 2 GHz. Think about that!
PS — One of the most talented physicists ever — Sir Fred Hoyle — once reflected on the fact that it would have been quite straightforward for anyone to alter the course of History before WWII considering that all knowledge regarding nuclear fission — and thus the path to the A-bomb — was published and available to anyone in the 1930s. “One page, just one page, and the history of the world would have been different! ” Then, he asked an obvious question: “Today, what should we write on such page?”
REFERENCES
Mapping magnetite in the human brain — Physics Today
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Havana Syndrome — First Magnetite Map of the Human Brain
Havana Syndrome — First Magnetite Map of the Human Brain [UPDATE : Magnetite causes cancer apoptosis under microwave irradiation]