All of us are subject to gravity. Gravity derives from “gravis” or “gravitas”, and means heavy, weight, serious. For our purposes, gravity might best be thought of as “the law of mutual attraction” which states that bodies are drawn to each other through gravitational attraction. The strength of their attraction is greater if they are close together, and lesser if they are more distant. This force of attraction exists between any two bodies. Or, we might refer to Newton’s third law of motion, “For every action, there is an equal and opposite reaction.” When we sit in a chair, our bodies exert a downward force into the chair, while the chair exerts an equally upward force through our bodies.