Natural law is an age-old theory that says that a universal moral code exists, providing humans with an intrinsic sense of right and wrong and a guideline for ethical behavior. This theory is rooted in the original musings of philosophers like Plato and Aristotle, who believed that natural laws granted humans the knowledge of what is right and essential to justice. Since then, leaders like Mahatma Gandhi and Martin Luther King Jr., have applied natural law to their teachings and civil disobedience against oppressive regime and oppressive social constructs.

At its core, natural law is defined by two components: it is universal and it is determined by human nature. Its universal quality means that these laws remain unchanged and consistent no matter the century or region. As the focus of natural law is determined by human nature and the innate inclination towards kindness, justice, and equity, these laws cannot be constructed or modified by governments or cultures.

Examples of natural law can be seen in both formal, academic disciplines and in everyday life. Philosophers use natural law as the basis for their arguments, while scientists and engineers use it as a guide to ethical choices surrounding technology, research, and progress. In everyday life, natural law is behind the Golden Rule -the rule that enforces treating others as we would want to be treated. In addition, the trend towards universal human rights and equal treatment of citizens regardless of race, gender, religion, or sexuality, can be seen as influenced by the teachings of natural law.

In sum, natural law is an ancient concept that enforces an immutable set of moral principles based on human nature, providing a foundation for right and wrong and ethical behavior. Despite being rooted in the teachings of Plato and Aristotle, this theory is still implemented and taken into consideration by today's thinkers and doers. People from all walks of life, from scientists to civil rights activists, can use this universal code for understanding ethical practices and building a better world.