Have you ever wondered why when you cut yourself skin regrows. Your answer is.... stem cells, they are unspecialized cells that can turn into any specialized cell in this case a skin cell to regrow skin
People are inclined to like this idea as it can be a great technological leap to reable to grow limbs and important organs in the body e.g. heart, kidneys and lungs. In animals like mice its been able to regrow the top part of fingers on mice according to livescience.com.
Getting stems cells can happen two ways once is getting adult stem cells from the bone marrow and a other is to get them from a embryo and those type of stem cells are called embryonic stem cells and and virtually can grow into any body part such as organs and limbs e.g. arm, torso, heart, brain and the eyes it can be anything but on the other side the adult stem cells can only become specialized stem cells and dont have the same propertys as the other type have according to Mayoclinic.org.
Furthermore stems cells have a great capacity to become anything in the body so if used in a specific way this can be a huge leap in medcine being able to regrow limbs and even organs i belive that this can be very good it might seem unethical but from one point you can let somone live or die and i prefer the first option witch is living. Even without stem cells we wouldn't be able to regrow skin so one little cut can mean dying that shows the importance of these cells.