The silent treatment
From now on, you won’t even hear the black helicopters coming. Just a breath of wind rustling your blinds, and then — bag on the head! At least, that’ll be the case if the NSA gets hold of some of these Blue Edge rotor blades from Eurocopter. They’re not only shaped like a sword you might find in Final Fantasy XIII, but they have little mechanized flaps that are automatically adjusted in order to reduce the wup-wup-wup noise that results from the blade cutting through turbulent air.