Identify the legal concept of negligence and discuss the elements necessary to establish a negligence cause of action as discussed in the text. Be sure to pay particular attention to the issues of causation, foreseeability, proximate cause and the defenses one may have to a negligence lawsuit as evidenced in Palsgraf v. Long Island Railroad Co., 248 N.Y. 339, 162 N.E. 99 (1928).