Stem cells were discovered around 1981, when the first embryonic cell was formed. These cells were discovered by Dr. James Till and Dr. Ernset McCulloch. Many experiments have been done, such as introducing stem cells into the hearts of pigs who had suffered a heart attack, and their hearts would end up looking brand new. For humans, this same experience worked on their hearts as well. Injecting stem cells into the heart can also help humans who have suffered a stroke. Say no to plagiarism. Get a tailor-made essay on “Why Violent Video Games Should Not Be Banned”? Get the original essay. Stem cells are cells that can divide and give rise to descendant cells that can continue to specialize. From what I've read, "stem cells are a continuous source of differentiated cells that make up the tissues and organs of animals and plants." There are two types of stem cells: adult cells and embryonic cells. In adult stem cells, the cells are usually found in small tissues. On the other hand, embryonic stem cells come from embryos. Stem cells can also be found in different parts of the body, in tissues. Stem cells are important because they help keep human cells happy and healthy. According to the Encyclopaedia Britannica, "...they have potential in developing therapies to replace defective or damaged cells resulting from various disorders..." They are also important to us because they can help restore bodies that have went through a difficult period. heart attack, heart disease and diabetes. Human embryonic stem cells are harvested from the blastocyst cell mass. Although this process requires the removal of the trophoblast, it is bad because it destroys it for further development. It can also lead to the unnecessary deaths of hundreds of people. Stem cells are beneficial to us because they help heal both animals and humans. Keep in mind: this is just a sample. Get a personalized article from our expert writers now. Get a personalized trial There are also stem cells that can be as good as human embryonic stem cells. They are called induced pluripotent stem cells. These cells are adult stem cells that are reprogrammed to have the same properties as embryonic cells, but scientists say they don't yet know if it's safe to inject them into humans. My opinion on all of this is that there should not be research that can destroy these cells, these cells can be used for beneficial purposes and should be pursued to cure diseases and injuries..