
Along with everything else on this planet, fruit have evolved over the years. They have developed thick skins that prevent insects and such from eating them. Scientists have discovered that there is a parasitic fig wasp that actually contains a needle-like appendage that is thinner than a human hair and works like a drill to pierce this skin. The scientists believe that their secret may be the zinc tip to this 'drill'. It is also able to bend with ease and not fracture, but stay hard at the same time. This discovery may lead to future innovations of needles, drills, and even surgeon's equipment.
http://dailydigestnews.com/2014/05/parasitic-wasp-taps-fruit-with-metal-drill-bit/