A tin foil hat is a piece of headgear made from one or more sheets of aluminum foil or similar material or a conventional hat lined with foil worn to shield the brain from electromagnetic fields, or against mind control and/or mind reading; or attempt to limit the transmission of voices directly into the brain. The concept of wearing a tin foil hat for protection from such threats has become a popular stereotype and term of derision; the phrase serves as a byword for paranoia and persecutory delusions, and is associated with conspiracy theorists.
The Daily Omnivore 
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