A young child just learning what sums are doesn’t realize they’re being introduced to the principle of addition, and the science of mathematics. Whatever is based in science is governed by principles or laws, be it music, tennis, or nuclear physics, and so on.
When a principle or law is first discovered, it’s usually followed by a period of experimentation and research, before it is deemed an advance in human thought. But the law itself, e.g., the law of gravity, is not new. The law existed before its discovery. Objects fell to the ground just as readily before Isaac Newton discovered the law of gravity. Studying the law governing a science gives a better understanding of its practicality to human situations.
As someone who studied several science subjects in school, I noticed that whether it’s a pure or applied science, it broadly has four essential elements. The first is the self-existing principle that governs the science. The second is the fixed, unvarying quality or constant value governing the implementation of the principle in every circumstance. The third is the discovery. Fourth is the understanding that comes from studying the science, adhering to its rules, and putting into practice what is learned.