The US Air Force plans to research whether or not body armor can replicate the strength of an arapaima’s exterior. This Amazonian fish, native to places like Brazil, Peru, and Guyan, is capable of fending off deadly piranha with its scales. This natural self-defense system is courtesy of evolution over millions of years, and has made the fish’s body protective and incredibly flexible. Naturally, the defense organization has wondered if this same composition in each individual scale could be mimicked in armor for humans and even planes. Read more at Popular Mechanics.