Ballistics is the science that studies the motion, behavior, and effects of projectiles, most commonly firearms and ammunition. It encompasses several specific areas: 1. **Internal Ballistics**: This involves the processes that occur inside the firearm from the moment the cartridge is fired until the projectile exits the barrel. It examines factors like the combustion of gunpowder, pressure build-up, and the mechanics of the firearm's action.

Materials science is an interdisciplinary field that focuses on the properties, performance, processing, and applications of materials. It combines principles from physics, chemistry, engineering, and biology to understand how different materials behave under various conditions and how their internal structures influence their macroscopic properties. Key aspects of materials science include: 1. **Understanding Material Properties**: This involves studying mechanical, thermal, electrical, optical, and magnetic properties of materials. Scientists use these properties to determine how materials will perform in different applications.

Mechanical engineering is a branch of engineering that involves the design, analysis, manufacturing, and maintenance of mechanical systems. It combines principles of physics, mathematics, material science, and engineering principles to solve problems related to mechanical systems and processes. Mechanical engineers work on a wide range of applications, including but not limited to: 1. **Thermodynamics:** Studying the behavior of heat and energy transfer in systems, applicable in engines, HVAC systems, and refrigeration.

Applied geometry is a branch of geometry that focuses on the practical application of geometric principles and methods to solve real-world problems. It encompasses various fields and combines geometric concepts with tools from mathematics, engineering, computer science, and other disciplines. Some key areas where applied geometry plays an important role include: 1. **Computer Graphics**: Used extensively in rendering images, animations, and visual effects through modeling shapes, transformations, and perspective.

Mathematical finance is a field of applied mathematics that focuses on the mathematical modeling and analysis of financial markets and instruments. It integrates concepts from probability theory, statistics, differential equations, and stochastic calculus to understand and manage financial risks and to price financial derivatives. Key areas of mathematical finance include: 1. **Option Pricing**: Developing models to determine the fair value of options and other derivatives. The Black-Scholes model is one of the most famous examples.

Besides the libertarian argument that one has the right to transfer their property to anyone they want, including their family, note that children have been raised and molded by the parent from birth, knowing that they will inherit the family business. As weird as it might seem, simply consider them a continuation of the dead parent; they will now continue administering the business. Then the same arguments as above for respecting private property apply.

There are several ways to make a profit, life would be pretty boring otherwise. Examples include:

But none of these factors are so powerful that a company in a free market can extract exorbitant profits from a customer unwillingly paying with no better choice. Note that intellectual property would not exist in a libertarian system. Of course, people sometimes buy products/services without doing their due diligence or simply not caring enough about ease of quitting, ease of repair, control, etc., and later face difficulties, but that is simply the consequence of their own decisions.