(YouTube Link)
Is that tinfoil hat that you wear on your head actually effective at keeping out subversive messages? Rick Crammond of British Columbia decided to find out. He tested a foil-lined cap to find out if it would block the electromagnetic pulse from a wireless modem. Good news! It works, and people may still laugh at you, but at least your brain is safe.
via Make
http://people.csail.mit.edu/rahimi/helmet/