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Tin-foil hat(Redirected from Tinfoil hat)
A tin-foil hat or aluminum foil deflector beanie (AFDB) is a piece of headgear designed to shield the brain from mind control and/or mind reading by surrounding it with a metallic lining (typically, aluminium foil or tin foil).
While there have been and still are many people who believe in the actual utility of such devices, the wearing of tin-foil hats has become a popular stereotype and term of derision, particularly in Internet culture.
This draws on the stereotypical image of belief in mind control by ESP, microwave radiation or other technological means as part of the symptoms of paranoid schizophrenia.
The delusion of "mind control rays" generally seems very real to those thus afflicted, and the making and wearing of improvised defences against the imagined rays is a commonly observed phenomenon in people afflicted by severe paranoid delusions.
It should be added that, as with all pseudoscience, there is a kernel of truth or reason to be found in the tin-foil hat story. A well constructed tin-foil hat would approximate a Faraday cage, reducing the amount of (notionally harmless) radiofrequency electromagnetic radiation that would otherwise pass through the subject's brain.
The efficency of such a tinfoil hat in blocking such radiation would depend on the thickness of the tinfoil, as dictated by the skin depth, the distance the radiation can propagate in a particular non-ideal conductor. For .5-mm-thick tinfoil, radiation above about 20 kHz (i.e., including both AM and FM bands) would be partially blocked. There is no one frequency at which blocking begins, since electromagnetic radiation can tunnel to a greater or lesser extent through a conductor whose thickness is comparable to its wavelength.
A notable appearance of tinfoil hats is the 2002 movie Signs where the children of the lead character wear tin-foil hats to avoid mind control.
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The above article is adapted from from Wikipedia All Wikipedia article text is available under the terms of the GNU Free Documentation License
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