Artificial organ almost always preceded by extensive experiments with animals. Initial testing in humans is frequently limited to those either already facing death or who have exhausted every other treatment possibility. Artificial arms and legs, or prosthetics, are intended to restore a degree of normal function to amputees. Mechanical devices that allow amputees to walk again or continue to use two hands have probably been in use since ancient times, the most notable one being the simple peg leg. Since then, the development of artificial limbs has progressed rapidly. New plastics and other materials, such as carbon fiber have allowed artificial limbs
Association for the Advancement of Artificial Intelligence It has in excess of 4,000 members worldwide. In its early history, the organization was presided over by notable figures in computer science such as Allen Newell, Edward Feigenbaum, Marvin Minsky and John McCarthy. The current president is Subbarao Kambhampati, and the president elect is Yolanda Gil. The AAAI provides many services to the Artificial Intelligence community. The AAAI sponsors many conferences and symposia each year as well as providing support to 14 journals in the field of artificial intelligence. AAAI produces a quarterly publication, "AI Magazine", which seeks to publish significant new research and literature across the entire field