I recommend an 8 layer tin foil hat folded and beaten by a Japanese swordsmith with no less than 40 years experience. Also to ensure good blood flow to the brain and to increase cognitive abilities, I recommend Trepanning:
http://en.wikipedia.org/wiki/Trephinning_in_pre-Columbian_Mesoamerica
http://en.wikipedia.org/wiki/Trephinning_in_pre-Columbian_Mesoamerica