I find this constant mention of tinfoil hats here disrespectful, demeaning and very condescending. It really sends the wrong message to the younger, newer members.
Tinfoil was replaced with aluminum years ago - the correct term is "aluminum foil hat". AFDB for the more technically inclined.
Please...
Aluminum Foil Deflector Beanie
Michael
Back when I was at NASA they were referred to as "tinfoil hats" even though they were all made out of aluminum foil. I think its more the tradition of the device.