First off, there is more than one kind of stem cell. Human stem cells are unique because they have the potential to become a specialized cell and can divide and renew themselves, according to the National Institutes of Health.
Doing Time as a Federal Prison: 1934-63. In 1933, the Army relinquished Alcatraz to the U.S. Justice Department, which wanted a federal prison that could house a criminal population too difficult or dangerous to be handled by other U.S. penitentiaries.
Prior to 1984 only one prison in the U.S. met supermax standards: the Federal Penitentiary in Marion, Illinois. By 1999, the United States contained at least 57 supermax facilities, spread across 30â34 states.