Numismatist noted numismatist who was not an avid collector, and King Farouk I of Egypt was an avid collector who had very little interest in numismatics. Harry Bass by comparison was a noted collector who was also a numismatist. The second group are the coin dealers. Often called professional numismatists, they authenticate or grade coins for commercial purposes. The buying and selling of coin collections by numismatists who are professional dealers advances the study of money, and expert numismatists are consulted by historians, museum curators, and archaeologists. See, for example, the International Association of Professional Numismatists (IAPN) and the British Numismatic
National Children's Study influence child health and development. The NCS will not collect any new information from participants. The NIH plans to make data already collected available to researchers in late 2015. National Children's Study The National Children’s Study (NCS) was a longitudinal cohort study that planned to recruit participants from across the United States of America. It was intended to measure the many factors that contribute to health and disease from before birth through age 21. This included, but was not limited to, the search for drivers of diseases with prenatal or developmental origins. The Study was closed in December 2014. The