Bulletproof glass has been a necessary innovation for as long as things have existed that have windows and which contain things that bad people want to shoot to death. Regular bulletproof glass is made from normal glass sandwiching a layer of polycarbonate thermoplastic, which is why the glass will still crack to pieces, but stay intact and not let the bullet through (hopefully).
The problem, of course, is that this goes both ways. Sure, the assassination target is safe inside the limo, but what if he's the proactive type, and wants to whip out his own gun to shoot back? He'd need some kind of magic substance that lets him shoot out, but won't let bad guy shoot in. Well, a security company called Armour Group has invented RhinoGLASS -- a type of glass that blocks bullets from the outside, but allows bullets from the other side to go through more or less without resistance.
Armour Group Channel
And through attackers more or less without resistance too.
Basically, the glass is coated on one surface with a hard layer of thermoplastic. A bullet fired from the outside will hit the hard layer first, and the soft layer will act as a shock absorber. The bullet fractures and slows, or stops altogether. But if you shoot it from the other side, the bullet goes through the softer section first, piercing it, then hits the hard layer which has nothing bracing it from the other side ...
Armour Group Channel
... so it can shatter it and kill the evildoers. Or the good guys; we guess you could be a dictator getting shot at by freedom fighters or something.
This isn't a one-use thing, either -- as long as they're not hitting the exact same spot over and over, the glass can be riddled with bullets from both sides, and still continue to work. For a while anyway. But, honestly, if you haven't shot the assassins by then, it's really your own fault.
Ready for more witchcraft? Then check out 6 Mind-Blowing Substances That Laugh In The Face Of Physics and 6 Substances That Wipe Their Ass With The Laws Of Physics.
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