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| | Tin-foil hat - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-10-22) |
 | | Hats made from foil are very rarely used, since the injuries they might guard against are highly speculative, and their effectiveness in preventing such harm would be dubious even if the danger were plausible. |
 | | While aluminium foil or tin-foil is traditional, less fragile materials such as 3M Velostat (a kind of metallised plastic) and metal window-screen mesh are now more commonly used. |
 | | A recent, somewhat tongue-in-cheek, study by graduate students at MIT determined that a tin-foil hat either amplified, or attenuated, incoming radiation in the GHz by as much as 20 dB, depending on frequency [1]; the effect was observed to be roughly independent of the relative placement of the wearer and radiation source. |
| en.wikipedia.org /wiki/Tinfoil_hat (988 words) |
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