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.
While the concept of social justice can be traced through Ancient and Renaissance philosophy, such as Socrates, Thomas Aquinas, Spinoza and Thomas Paine, the term social justice became used explicitly from the 1840s. The official Catholic doctrine on social justice can be found in the book Compendium of the Social Doctrine of the Church, published in 2004 and updated in 2006, by the Pontifical Council Iustitia et Pax.