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.