Stem cells have the ability to grow and multiply into many different cells in the body's early life. Stem cells help replace dead and/or damaged cells in the human body. These stem cells are found within the body, within our organs and tissues such as the skin and liver. Each stem cell helps its organ or tissue, like if the liver is damaged, the liver stem cells would repair the liver. There are four main types of stem cells: adult, fetal and embryonic. Each of these stem cells acts differently and has its own nature. There have been many debates about whether or not research into these cells should be funded. Many people agree with letting the government allow them to use funds for this research. However, there are many people who oppose federal funding for stem cell research. This is a very controversial topic and public policy regarding these cells is slowly developing. Technical aspects The first type of stem cells is known as adult stem cells. This type is mainly found in the brain, blood vessels, bone marrow, skin, heart, liver and other organs and tissues. The ones previously listed are the main places where these cells are found. These cells remain dormant or hidden for several years. Adult stem cells are the main cells used for treatment. They are located within the tissue in a specific area. When the body needs new cells or even just more cells, these adult stem cells begin to divide and create new cells. They do this when the body feels in trouble, such as when it suffers from an illness or injury. Adult stem cells will activate and divide whenever the body feels in danger. The adult stem cells are then isolated in many ways depending on the area of ​​the body and placed in the middle of a sheet of paper to program these stem cells. There have been no laws or guidelines issued since May 15, 2013. Researchers continue to try to learn more about these stem cells and it is hoped that one day researchers will be able to use these cells for medical purposes. Works Cited Kilpatrick, D. G. (2014). Definitions of public order and law. National research center on the prevention of violence against women. Obama, B. (2009). Executive Order 13505 – Remove Barriers to Responsible Scientific Research Involving Human Stem Cells | The White House. Retrieved January 15, 2014, from http://www.whitehouse.gov/the_press_office/Removing-Barriers-to-Responsible-Scientific-Research-Involving-Human-Stem-Cells/Research America (2014). Timeline of major events in stem cell research policy: - Research America. Retrieved from http://www.researchamerica.org/timeline#1996.