The Tin Foil Hat
To have any effect against any form of electromagnetic radiation it would need to be in several hundred layers, probably need to be built up to a couple of inches thick, as to the need, well we all live fine without them.
Almost every house must have a roll of aluminium foil, it needs no skill to make, just drop a large enough piece on your head and shape, if it does fit add more.
The idea of the tin foil hat is it protects your mind against electromagnetic radiation, mind control and mind reading.
To have any effect against any form of electromagnetic radiation it would need to be in several hundred layers, probably need to be built up to a couple of inches thick, as to the need, well we all live fine without them.
The use against Alien mind probes, Govemenent telepaths is of course just rubbish conspiracy theorist and probably a result of popular science fiction books and literature.