I was introduced to this concept a few years ago as I was looking through a book on my brother-in-law's desk. The book was called "The Seven Habits of Highly Effective People" written by Stephen Covey. His system advocates the use of four quadrants to.
Cholesterol is a waxy, fat-like substance naturally found in all of our body’s cells. Too much of it, however, can clog our arteries and contribute to a host of problems, including heart disease and heart attack.