Potassium is one of the major electrolytes (together with sodium, chloride and magnesium) that conducts electricity in the human body. It also plays important roles in muscle contraction, nerve impulse transmission, and in maintaining the balance of fluids in the body.
The first modern usage of the specific term social justice is typically attributed to Catholic thinkers from the 1840s, including the Jesuit Luigi Taparelli in CiviltÃ  Cattolica, based on the work of St. Thomas Aquinas.
In the later 20th century, social justice was made central to the philosophy of the social contract, primarily by John Rawls in A Theory of Justice (1971). In 1993, the Vienna Declaration and Programme of Action treats social justice as a purpose of the human rights education.