Secret liquid armor instantly hardens to stop bullets

Even the best bulletproof vests can't keep the fastest projectiles from getting through, but now there's a custard-like goo that does an even better job than Kevlar. It works by making molecules lock together when they're hit.

These "shear-thickening liquids" have been used in the past by downhill skiers to prevent broken bones and injuries, but this is the first time the strange secret liquid has been proven effective as armor. The biggest advantage is its light weight and flexibility, resulting in an ideal bulletproof vest.

Via BBC