On the Effectiveness of Aluminium Foil Helmets

On the Effectiveness of Aluminium Foil Helmets: An Empirical Study (article)

It has long been suspected that the government has been using satellites to read and control the minds of certain citizens. The use of aluminum helmets has been a common guerrilla tactic against the government's invasive tactics [1]. Surprisingly, these helmets can in fact help the government spy on citizens by amplifying certain key frequency ranges reserved for government use. In addition, none of the three helmets we analyzed provided significant attenuation to most frequency bands.
We describe our experimental setup, report our results, and conclude with a few design guidelines for constructing more effective helmets.

Haha! So if you fear the government is spying on you, do NOT wear an aluminum hat!!! It only helps them spy on you! (The theory of wearing an aluminum hat to block brain signals must have been a big project by the government so that they could actually read your thoughts better!)
It’s time to move on to the new theory of cat-on-the-head to block the signals. (If you do this, please send pics, I'll post em. ^_^ )