Piranha - A fish found in South American that is known for its sharp teeth.
Arapaima - A fish found in South America with specially designed scales that can withstand the bite of a piranha fish.
Biomimetics - The study of biological materials from living organisms, with the goal of mimicking them to produce better synthetic materials.
Ceramic - A nonmetallic material that is often strong and hard, but usually brittle and inflexible, except in some cases, such as the natural Arapaima scales.
Investigation into the internal flow mechanism of underwater supersonic gas jets generated by beveled novels provides insight into underwater vehicle design.