There's a great story somewhere on MSNBC, and thanks for providing this link, Myron!
Anyway, the mom of an American soldier in Iraq organized people to send Silly String to our troops. They can shoot the Silly string into a room or anyplace, and if there are trip wires, the silly string will lightly drape over them, thus saving lives.
Anyway, this mom got someone to send 80,000 cans of the stuff over to Iraq, which has just been shipped, apparently. It's neat to hear about a low-tech solution to the challenge of how to keep our soldiers safe.