Bee stingers work like saws to pump venom  

It’s one of nature’s seemingly magical tricks. A honey bee (Apis mellifera) stings a victim, and the stinger will still pump venom into a wound even after it has fully detached from the bee’s body. Thanks to some high-speed video, we may finally know the secrets behind this sting. A team in Australia found that the tiny 2 millimeter (or only 0.08 inch) stinger of a honey bee works like a double-piston micro-pump. It pumps in two different directions and can deliver a conti