How do metal detectors work?
You know the drill: hand luggage in the X-ray thingy, put coins-phone-keys-bracelets-watch-necklace in the tray and ready for the metal detector. How the eff does it know I forgot to take off my stupid belt?!

You know the drill: hand luggage in the X-ray thingy, put coins-phone-keys-bracelets-watch-necklace in the tray and ready for the metal detector. How the eff does it know I forgot to take off my stupid belt?!
