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
Traditional Chinese medicines derived from the human body placenta in the ground for 7 to 8 years, and it dissolves into a fluid that is as clean as ice. In south China, people blend human placenta with "gāncǎo" 甘草 ""Glycyrrhiza uralensis"; Chinese licorice root", "shēngmá" 升麻 ""Cimicifuga simplex"; bugbane", and other drugs, which they store in a bottle, and bury in the ground for 3 to 5 years. Then they dig it up and use it medicinally. The 52.24 "rénpò" 人魄 "Human ghost (of a hanged person)" medicine refers to Chinese hun and po soul dualism between the "hun" 魂 "spiritual, ethereal, yang soul" that leaves the body